HOME /

Publications

  1. D.A. Kappos and N. Kehayopulu, Some remarks on the representation of lattice ordered groups, Mathematica Balkanica 1 (1971), 142-143.
    MR 44 (1972B): 5263 (W.C. Holland).
    Zentralblatt 231: 06021 (P.F. Conrad).
  2. N. Kehayopulu, m-lattices and the algebra of polar subsets of a lattice, The Greek Math. Soc., Vol. 12, Num. 2 (1971), 225-282. Doctoral Dissertation. MR 4 (1973B): 8590 (D.A. Kappos)
    Zentralblatt 241: 06010 (Autorreferat).
    Bull. Analytique de Bibliographie Hellenique XXXII (1971), pp. 121-123.
  3. N. Kehayopulu, A characterization of semiregular and regular m-lattices, The Greek Math. Soc., C. Carathéodory Inter. Sym., Sept. 3-7, 1973, pp. 282-295. Edited by A. Panayotopoulos.
    MR 57 (1979): 5842 (H.A. Priestley).
  4. N. Kehayopulu, On <m, n>-regular le-semigroups, Mathematica Balkanica 5 (27) (1975), 152-154.
    Zentralblatt 384: 06018 (Autorreferat).
  5. N. Kehayopulu, On a characterization of regular duo le-semigroups, Mathematica Balkanica 7 (22) (1977), 181-186.
    MR 83d: 06019 (F.D. Petersen).
  6. N. Kehayopulu, A characterization of some regular duo le-semigroups. In: Contributions to General Algebra -Proc. of the Klagenfurt Conf., Edited by H. Kautschitsch, W. Müller, W. Nöbauer. Verlag Johannes Heyn, 1979, pp. 137-143.
    MR 81I: 20083 (Donald W. Müller).
    Zentralblatt 444: 06017 (H. Mitsch).
  7. N. Kehayopulu, On <m,k,n>-ideal elements on poe-semigroups. In: Notes on Semigroups VII (1981) (4), pp. 19-24, Karl Marx Univ. Econ., Dept. Math., Budapest. Edited by S. Lajos.
    Zentralblatt 477: 06013 (B. Pondelícek).
  8. N. Kehayopulu, On intra-regular ∨e-semigroups, Semigroup Forum 19 (1980), 111-121.
    Communicated by N.R. Reilly.
    MR 81c: 20047 (M. Yamada).
    Zentralblatt 424: 0-6015 (K. Todorov).
  9. N. Kehayopulu, Generalized ideal elements in poe-semigroups, Semigroup Forum 25 (1982), 213-222.
    Communicated by Tôru Saitô.
    MR 84b: 20073 (S. Sri. Hari Nagore).
    Zentralblatt 499: 06012 (Tatsuhiko Saito).
  10. N. Kehayopulu, A characterization of regular le-semigroups, Semigroup Forum 23 (1981), 85-86.
    Communicated by Tôru Saitô.
    MR 82j: 20112 (From the text).
    Zentralblatt 467: 06010 (H. Mitsch).
  11. N. Kehayopulu, On regular poe-semigroups. In: Contributions to General Algebra 2 -Proc. of the Klagenfurt Conf., Edited by G. Eigenthaler, H. K. Kaiser, W. Müller, W. Nöbauer. Hölder-Pichler-Tempsky, Wien; B. G. Teubner, Stuttgart, 1983, pp. 191-196.
    MR 84k: 06017 (Editors).
    Zentralblatt 53l: 06015 (S. Lajos).
  12. N. Kehayopulu, Regular ordered semigroups, Docent work (Habilitation). University of Athens, 1980.
  13. N. Kehayopulu, On regular le-semigroups, Semigroup Forum 28 (1984), 371-372.
    Communicated by Tôru Saitô.
    MR 85I: 06027 (Francis Pastijn).
    Zentralblatt 534 : 06006 (M. Deaconescu).
  14. N. Kehayopulu, On regular and intra-regular poe-semigroups, Semigroup Forum 29 (1984), 255-257.
    Communicated by Tôru Saitô.
    MR 85j: 06014 (Editors).
    Zentralblatt 537: 06013 (M. Deaconescu).
  15. N. Kehayopulu, On left (resp. right) duo regular poe-semigroups, Semigroup Forum 31 (1985), 123-125.
    Communicated by Tôru Saitô.
    MR 86d: 06020 (S. Lajos).
    Zentralblatt 549: 06008 (S. Lajos).
  16. N. Kehayopulu, Introduction to Lattice Theory (In Greek), University of Athens, December 1985.
  17. N. Kehayopulu, On regular and intra-regular poe-semigroups. In: Research and Exposition in Mathematics, Edited by Karl H. Hofmann and Rudolf Wille, Vol. 14: Algebra and Order -Proc. First Intern. Symp. on Ordered Algebraic Structures, Luminy- Marseilles, 1984, S. Wolfenstein, Editor. Heldermann Verlag, Berlin, 1986, pp. 335- 340.
    MR 88g: 06019 (G. Szász).
    Zentralblatt 609: 06011 (M. Deaconescu).
  18. N. Kehayopulu, On weakly commutative poe-semigroups, Semigroup Forum 34 (1987), 367-370.
    Communicated by Tôru Saitô.
    MR 88a: 06020 (Editors).
    Zentralblatt 613: 06009 (M. Deaconescu).
  19. N. Kehayopulu, On weakly prime, weakly semiprime, prime ideal elements in poe-semigroups, Mathematica Japonica 34 (3) (1989), 381-389.
    Communicated by Kiyoshi Iséki.
    MR 90f : 06028 (St. Schwarz).
    Zentralblatt 675: 20052 (H. Mitsch).
  20. N. Kehayopulu, On minimal quasi-ideal elements in poe-semigroups, Mathematica Japonica 34 (5) (1989), 767-774.
    Communicated by Kiyoshi Iséki.
    MR 90m : 06029 (N. Prabhakara Rao).
    Zentralblatt 0709: 06010 (J. Fronková).
  21. N. Kehayopulu, On filtres generated in poe-semigroups, Mathematica Japonica 35 (4) (1990), 789-796.
    MR 91f : 06028 (R.B. McFadden).
    Zentralblatt 711: 06013 (H. Mitsch).
  22. N. Kehayopulu and P. Kiriakuli, The ideal extensions of lattices, Simon Stevin 64 (1) (1990), 51-60.
    Communicated by B.M. Schein.
    MR 91h: 06013 (From the text).
    Zentralblatt 711: 06010 (J. Duda).
  23. N. Kehayopulu, P. Kiriakuli, S. Hanumantha Rao and P. Lakshmi, On weakly commutative poe-semigroups, Semigroup Forum 41 (1990), 373-376.
    Communicated by R.B. McFadden.
    MR 91f : 06012 (R.B. McFadden).
    Zentralblatt 708: 06011 (H. Mitsch).
  24. N. Kehayopulu, On weakly prime ideals of ordered semigroups, Mathematica Japonica 35 (6) (1990), 1051-1056.
    MR 91j: 06032 (Summary).
    Zentralblatt 717: 06006 (The editors)
  25. N. Kehayopulu, On left regular ordered semigroups, Mathematica Japonica 35 (6) (1990), 1057-1060.
    MR 91j: 06033 Summary).
    Zentralblatt 717: 06007 (The editors)
  26. N. Kehayopulu, Remark on ordered semigroups, Mathematica Japonica 35 (6) (1990), 1061-1063.
    MR 91j: 06034 (Summary).
    Zbl 0717.06008 (The editors)
  27. N. Kehayopulu, On right regular and right duo ordered semigroups, Mathematica Japonica 36 (2) (1991), 201-206.
    MR 92a: 06017 (Summary).
    Zentralblatt 736: 06019 (T.S. Blyth).
  28. N. Kehayopulu, The chain of right simple semigroups in ordered semigroups, Mathematica Japonica 36 (2) (1991), 207-209.
    MR 92a: 06018 (Summary).
    Zentralblatt 736: 06020 (T.S. Blyth).
  29. N. Kehayopulu, Note on Green’s relations in ordered semigroups, Mathematica Japonica 36 (2) (1991), 211-214.
    MR 92a: 06019 (Summary).
    Zentralblatt 736: 06021 (T.S. Blyth).
  30. N. Kehayopulu, On ordered semigroups without nilpotent ideal elements, Mathematica Japonica 36 (2) (1991), 323-326.
    MR 92d: 06033 (Juturu Hanumanthachari).
    Zentralblatt 736: 06022 (T.S. Blyth).
  31. N. Kehayopulu, On weakly commutative poe-semigroups, Mathematica Japonica 36 (3) (1991), 427-432.
    MR 92e: 06029a (Summary).
    Zentralblatt 728: 06011 (Summary).
  32. N. Kehayopulu, On adjoining identity to semigroups, greatest element to ordered sets, Mathematica Japonica, 36 (4) (1991), 695-702.
    MR 92h: 06091 (Gracinda M.S. Gomes).
    Zentralblatt 759: 20018 B.L. Madison (Fayetteville).
  33. N. Kehayopulu, On completely regular poe-semigroups, Mathematica Japonica 37 (1) (1992), 123-130.
    MR 92m: 06026 (Summary).
    Zentralblatt 745: 06007 (Summary).
  34. N. Kehayopulu, On regular duo ordered semigroups, Mathematica Japonica 37 (3) (1992), 535-540.
    MR 92m: 06027 (Summary).
    Zentralblatt 760: 06006 (Summary).
  35. N. Kehayopulu, On prime, weakly prime ideals in ordered semigroups, Semigroup Forum 44, no. 3 (1992), 341-346.
    Communicated by J.S. Ponizovskii.
    MR 93a: 06016 (From the text).
    Zentralblatt 756: 06008 (J. Sevecková).
  36. N. Kehayopulu, On left regular and left duo poe-semigroups, Semigroup Forum 44 (1992), 306-313.
    Communicated by J.S. Ponizovskii.
    MR 92m: 06028 (From the text).
    Zentralblatt 756: 06007 (J. Sevecková).
  37. N. Kehayopulu and M. Tsingelis, Remark on ordered semigroups. In: Ljapin, E. S. (edit.), Decompositions and Homomorphic Mappings of Semigroups. Interuniversitary collection of scientific works. St. Petersburg: Obrazovanie, (ISBN 5-233-00033-4), pp. 50-55 (1992).
    Communicated by E.S. Ljapin.
    MR 95c: 06030 (Frank A. Smith).
    Zentralblatt 823: 06006 (Summary).
  38. N. Kehayopulu and M. Tsingelis, {\cal N}-subsets of ordered semigroups. In: Ljapin, E.S. (edit.), Decompositions and Homomorphic Mappings of Semigroups. Interuniversitary collection of scientific works. St. Petersburg: Obrazovanie, (ISBN 5-233-00033-4), pp. 56-63 (1992).
    Communicated by E.S. Ljapin.
    MR 95c: 06031 (N. Prabhakara Rao).
    Zentralblatt 823: 06007 (Summary).
  39. N. Kehayopulu and M. Tsingelis, On the decomposition of prime ideals of ordered semigroups into their N-classes, Semigroup Forum 47, no. 3 (1993), 393-395.
    Communicated by J.S. Ponizovskii.
    MR 94i: 06016 (T.S. Blyth).
    Zentralblatt 782: 06013 (H. Mitsch).
  40. N. Kehayopulu, On intra-regular ordered semigroups, Semigroup Forum 46, no. 3 (1993), 271-278.
    Communicated by J.S. Ponizovskii.
    MR 94b: 06021 (Mark Verus Lawson).
    Zentralblatt: 776: 06013 (H. Mitsch)

  41.  N. Kehayopulu, On semilattices of simple  poe-semigroups, Mathematica Japonica 38 (2) (1993), 305-318. MR 94a:  06031 (Mark Verus Lawson); Zentralblatt 764:  06007.

  42. N. Kehayopulu, On adjoining greatest element to ordered semigroups, Mathematica Japonica 38 (1) (1993), 61-66. Communicated by Kiyoshi Iséki. MR 94g :  06023 (From the text); Zentralblatt 778: 06013 (Summary).

  43. N. Kehayopulu and Ph. Argyris, An algorithm for Light’s associativity test using Mathematica,   Journal of  Computing  and Information, Volume 3, no.  1, (1993), 87-98.

  44.   N. Kehayopulu, S. Lajos and M. Tsingelis, On intra-regular ordered semigroups, Pure Math. and Appl. 4 (3) (1993), 317-327. MR 96a: 06025 (B. Pondelícek); Zentralblatt: 803: 06014.

  45. N. Kehayopulu, On regular, intra-regular ordered semigroups, Pure Math. and Appl. 4 (4) (1993), 447-461. MR 95j: 06017 (Juturu Hanumanthachari).

  46. N. Kehayopulu, On regular  le-semigroups, Semigroup Forum 49, no. 2 (1994), 267-269. Communicated by J. S. Ponizovskii. MR 95f: 06027 (Jacques Lévy-Bruhl); Zbl 0811.06014 H. Mitsch (Wien)

  47. N. Kehayopulu, On regular, regular duo ordered semigroups, Pure Math. and Appl. 5 (1994), No. 2, 161-176. MR 96c: 06024 (B. Pondelícek); Zentralblatt 837 (06010) (B.L. Madison).

  48. N. Kehayopulu and S. Lajos, On regular, regular and intra-regular ordered semigroups, Pure Math. and Appl. 5 (2) (1994), 177-186. MR 96c: 06025 (B. Pondelícek); Zentralblatt 823:  06008 (H. Mitsch).

  49. N. Kehayopulu, S. Lajos and M. Tsingelis, Note on prime, weakly prime ideals in ordered semigroups, Pure Math. and Appl. 5 (3) (1994), 293-297. MR 96c: 06026 (Summary); Zentralblatt 823:  06009 (Summary).      

  50. N. Kehayopulu and M. Tsingelis, Pseudoorder in ordered semigroups, Semigroup Forum 50, no. 3 (1995), 389-392. Communicated by J.S. Ponizovskii. MR 96a: 06026 (Juturu Hanumanthachari); Zentralblatt 828: 06010 (H. Mitsch).

  51. Kehayopulu, Niovi; Ponizovskii, J. S. The chain of right simple semigroups in ordered semigroups. Zap. Nauchn. Sem. S.-Peterburg. Otdel. Mat. Inst. Steklov. (POMI) 227 (1995), Voprosy Teor. Predstav. Algebr i Grupp. 4, 83--88, 158; translation in J. Math. Sci. (New York) 89 (1998), no. 2, 1133–1137.

  52. N. Kehayopulu, Note on bi-ideals in ordered semigroups, Pure Math. and Appl., 6 (4) (1995), 333-344. Zbl 0854.06023 (The editors).

  53. N. Kehayopulu and S. Lajos, A note on semigroups, ordered semigroups, Pure Math. and Appl. 6 (1995), No. 1, 51-56.

  54. N. Kehayopulu and M. Tsingelis,  Note on prime, weakly prime ideals in ordered semigroups, semigroups, Pure Math. and Appl., 6 (4) (1995), 345-348. Zbl 0854.06024 (The editors)

  55. N. Kehayopulu, Introduction to the Theory of Order, University of Athens, 1995 (in Greek).

  56.  N. Kehayopulu and M. Tsingelis, On subdirectly irreducible ordered semigroups, Semigroup Forum 50, no. 2 (1995), 161-177. MR 96g: 06017 (From the text); Zentralblatt 823: 06010 (H. Mitsch)

  57. N. Kehayopulu and M. Tsingelis, The embedding of an ordered semigroup in a simple one with identity, Semigroup Forum, 53 (1996), 346-350. Communicated by J.S. Ponizovskii. Zbl 0862.06004 M. Droste (Dresden)

  58. N. Kehayopulu, A note on ordered semigroups, semigroups, Pure Math. and Appl., 7 (No. 3-4) (1996), 293-299.

  59. N. Kehayopulu, Remark on ordered semigroups, semigroups, Pure Math. and Appl., 7 (No. 1-2) (1996), 111-128.

  60. N. Kehayopulu and M. Tsingelis,  The ideal extensions of ordered semigroups, Bull. Greek Math. Soc. 38 (1996), 89-93. -Proc. of the 1st Panhellenic Alg. Conf., 27-28 Sept. 1996. Zlb 0902.06025 (H. Mitsch).

  61. N. Kehayopulu, and G. Lepouras, Applications of order for finite sets using computer, University of Athens, 1996 (in Greek).

  62. N. Kehayopulu, On regular ordered semigroups, Mathematica Japonica, 43 (3) (1997), 549-553. Zbl 0895.06009 H. Mitsch (Wien)

  63. N. Kehayopulu, S. Lajos and M. Tsingelis, A note on filtres in ordered semigroups, Pure Math. and Appl., 8 (1) (1997), 83-93. Zbl 0902.06023, Manfred Droste

  64. N. Kehayopulu, On minimal quasi-ideals in ordered semigroups, Sovremennaja Algebra, St. Petersburg Gos. Ped. Herzen Inst., 2 (22) (1997), 41-45. [See also  Abstracs AMS 15 (6) (1994), *94T-06-138].

  65. N. Kehayopulu, Note on left regular and left duo poe-semigroups, Sovremennaja Algebra, St. Petersburg Gos. Ped. Herzen Inst., 2 (22) (1997), 32-35.  [See also Abstracts AMS 13 (1) (1992), *92T-06-17].

  66. N. Kehayopulu, On normal ordered semigroups, Pure Math. and Appl. 8 (2-3-4) (1997), 281-291. MR 99m: 06028 (Frank A. Smith); Zbl 902. 06024 (Thomas B. Muenzenberger).

  67. N. Kehayopulu, G. Lepouras and M. Tsingelis, On right regular and right duo ordered semigroups, Mathematica Japonica, 46 (2) (1997), 311-315. MR 98m: 06019 (Alexey Vernitskii); Zbl  890.06009 H. Mitsch.

  68. N. Kehayopulu, S. Lajos, G. Lepouras, A note on bi- and quasi-ideals of semigroups, ordered semigroups, Pure Math. and Appl., 8, No. 1 (1997), 75-81.Zbl 0902.06022 (The editors)

  69. N. Kehayopulu, Note on chains of right simple semigroups in ordered semigroups, Sovremennaja Algebra, St. Petersburg Gos. Ped. Herzen Inst., 2 (22) (1997), 36-40.

  70. N. Kehayopulu, Extensions of Semigroups, University of Athens, April, 1997 (in Greek).

  71. N. Kehayopulu, Fundamental Concepts, Linear Spaces, University of Athens, 1997.

  72. N. Kehayopulu and M. Tsingelis, On weakly commutative ordered semigroups, Semigroup Forum, 56, no. 1 (1998), 32-35. [See also Abstracts AMS 15 (3) (1994), *94T-06-61]. Communicated by D. R. Brown.  Zentralblatt:  890:06010 (H. Mitsch); MR 99b: 06014 Juturu Hanumanthachari.

  73. N. Kehayopulu and M. Tsingelis, On intra-regular ordered semigroups, Semigroup Forum, 57, no. 1 (1998), 138-141. Communicated by J.S. Ponizovskii. Zbl. 906.06011 Xie Xiang-Yun

  74. N. Kehayopulu, On left (resp. right) duo regular ordered semigroups, Pure Math. and Appl., 9 (1998), (3-4), 333-339. Zbl 0962.06010 (Summary).
  75. N. Kehayopulu and M. Tsingelis, On separative ordered semigroups, Semigroup Forum, 56, no. 2 (1998), 187-196. Communicated by J.S. Ponizovskii. MR 99c: 06017 B. Pondelicek.
  76. N. Kehayopulu and G. Lepouras, The determination of right ideals, bi-ideals and quasi-ideals of finite ordered semigroups using Turbo Pascal 7.0.

  77. N. Kehayopulu, A note on left regular and left duo poe-semigroups, Mathematica Japonica, 47 (1) (1998), 85-86. Zbl 0916.06013 (The editors)

  78. N. Kehayopulu and G. Lepouras, On right regular and right duo poe-semigroups, Mathematica Japonica, 47 (2) (1998), 281-285. MR 99d: 06020 (Mark Verus Lawson) ; Zbl 0903.06012 (The editors)

  79. N. Kehayopulu, Note on chains of simple semigroups in ordered semigroups, Mathematica Japonica, 47, no. 1 (1998), 87-92.

  80. N. Kehayopulu, On completely regular ordered semigroups, Scientiae Mathematicae (elect. journ.), 1 (1) (1998), 27-32. MR 2000b: 06046 (Johnny A. Johnson); Zbl 0905.06011 (The editors)

  81. N. Kehayopulu, A note on strongly regular ordered semigroups, Scientiae Mathematicae (elect. journ.), 1 (1) (1998), 33-36. MR 2000e: 06021 (Franz B. Kalhoff); Zbl 0905.06012 (The editors)

  82. N. Kehayopulu and M. Tsingelis,  A characterization of strongly regular ordered semigroups, Mathematica Japonica, 48 (2) (1998), 213-215. MR 2000b: 06045 (Alexey Verniskii); Zbl  932.06011 Xiang-Yun Xie

  83. N. Kehayopulu and St. Alex, The determination of pseudoorders of finite ordered semigroups using Turbo Pascal 6.0, Sovremennaja Algebra, St. Petersburg Gos. Ped. Herzen Inst., 3 (23) (1998), 59-71 (Στα Ρωσικά -μεταφράστηκε από τους editors).

  84. N. Kehayopulu and St. Alex, The determination of finite non-isomorphic ordered semigroups using Turbo Pascal 6.0, Scientiae Mathematicae, 1, no. 3 (1998), 283-286.

  85. N. Kehayopulu, Topics from the Theory of Semigroups, University of Athens, February 1998 (in Greek).

  86. N. Kehayopulu, J. S. Ponizovskii,  M. Tsingelis, The embedding  of an  ordered semigroup  into an  ordered group by means of  pseudoorder (Russian, English), J. Math. Sci., New York 95 (2) (1999), 2108-2110, translation from  Zap. Nauchn. Semin. POMI, 236 (1997), 106-110. Zbl 0927.06011 (The editors)

  87. N. Kehayopulu and M. Tsingelis,  Generalized  ideals in  ordered  semigroups, Pure Math. and Appl. 10 (1) (1999), 59-67. MR 2000j: 06009 (B. Pondelicek).

  88. N. Kehayopulu, A note of left (resp. right) simple  poe-semigroups, Scientiae Mathematicae       Vol. 2, No. 3 (1999), 269-271.

  89. N. Kehayopulu, Characterizations of some classes of le-semigroups, Scientiae Mathematicae Vol. 2, No. 3 (1999), 273-278. Zbl 0962.06012 (Summary)

  90. N. Kehayopulu, A note on regular and left duo poe-semigroups, Scientiae Mathematicae Vol. 2, No. 3 (1999), 293-294. Zbl 0916.06013. 

  91. N. Kehayopulu, A note on  poe-semigroups with idempotent ideal elements, Scientiae Mathematicae Vol. 2, No. 3 (1999), 295-298. Zbl 0962.06014 (Summary)

  92. N. Kehayopulu, On union of right simple semigroups, in ordered semigroups, Scientiae Mathematicae, Vol. 2, no. 3 (1999), 299-302. Zbl 0962.06015 (Summary)

  93. N. Kehayopulu, Interior ideals and interior ideal elements in ordered semigroups, Pure Math. and Appl. Vol. 10, no. 3 (1999), 323-329.

  94. N. Kehayopulu, Note on interior ideals, ideal elements in ordered semigroups, Scientiae Mathematicae Vol. 2, no. 3 (1999), 407-409. Zbl 0962.06016 Summary

  95. N. Kehayopulu and M. Tsingelis, A note on fuzzy sets in semigroups, Scientiae Mathematicae Vol. 2, no. 3 (1999), 411-413. Zbl 0960.20040 (Summary)

  96. N. Kehayopulu and Michael Tsingelis, A characterization of weakly prime and weakly semiprime ideals of semigroups is terms of fuzzy subsets, Sovremennaja Algebra 4 (24) (1999), 85-88.

  97. N. Kehayopulu and G. Lepouras, The determination of semilattice congruences of finite semigroups, ordered semigroups using Turbo Pascal 7.0, Sovremennaja Algebra 5 (25) (2000), 47-62 (in Russian). [Είχε γίνει δεκτή και στο Journal of Computing and Information αλλά για τεχνικούς λόγους δεν την δημοσίευσα εκεί].

  98. N. Kehayopulu and M. Tsingelis, A note on semilattice congruences in ordered semigroups (in Russian), IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII MATEMATIKA, 453, No. 2 (2000), 50-52. (In Russian). Simultaneously in English translation by the Allerton Press in Russ. Math. (IZ. Vuz.)  44 (2000), no. 2, 48-50. Zbl  0976.06009  Yuri Movsisyan (Yerevan).

  99. N. Kehayopulu and M. Tsingelis, The embedding of some ordered semigroups into ordered groups, Semigroup Forum 60, no. 3 (2000), 344-350. Communicated by J.S. Ponizovskii. ZMATH 0960.06008 (Xie Xiang-Yun).

  100. N. Kehayopulu and M. Tsingelis, A remark on congruences in ordered semigroups, (in Russian), IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII MATEMATIKA No. 5, 456 (2000), 37-39. Simultaneously in English translation by the Allerton Press in Russ. Math. 44 (5) (2000), 35-37 [ISSN 1066-369X].

  101. N. Κεχαγιοπούλου, Ημιομάδες με μη σημειακό χαρακτήρα (Semigroups with pointless character), Πανεπιστήμιο Θεσσαλονίκης, Πολυτεχνική Σχολή, Γενικό Τμήμα, Τομέας Μαθηματικών. Θεσσαλονίκη 2000, σελ. 217-235. Επιμέλεια Έκδοσης:  Μ. Κωνσταντινίδου, Κ. Σεραφειμίδης, Γ. Τσάγκας.

  102. N. Kehayopulu, J. S Ponizovskii, M. Tsingelis, Note on bi-ideals in ordered semigroups and in ordered groups, Zap. Nauchn. Sem. S.-Petersburg Otdel. Mat. Inst. Steklov (POMI) 265 (1999), Vopr. Teor. Predst. Algebr I Grupp. 6.       198-201, 327 (2000). Translated in J. Math. Sci, (New York), J. Soviet Math. MR (2000:12) 07F05 (N. Ya. Medvedev); Ζbl 1047.06008 Reviewer Ε.S. Golod (Moskva).

  103. N. Kehayopulu and S. Lajos, Note on quasi-ideals of ordered semigroups, Pure Math. and Appl. 11, no. 1 (2000), 67-69.

  104. N. Kehayopulu and M. Tsingelis, A note on fuzzy sets of groupoids-semigroups,     Scientiae Mathematicae Vol. 3, no. 2 (2000), 247-250. ZMATH:  0966.06020 Xiang-Yung Xie.

  105. N. Kehayopulu and M. Tsingelis, A note on ordered groupoids-semigroups, Scientiae Mathematicae Vol. 3, no. 2 (2000), 251-255. ZMATH 0966.06019  H. Mitsch

  106. N. Kehayopulu and M. Tsingelis, On right simple and right  0-simple ordered groupoids-semigroups, Scientiae Mathematicae Vol. 3, no. 3 (2000), 335-338. Zbl 0973.06014  H. Mitsch.

  107. N. Kehayopulu and M. Tsingelis, Characterizations of 0-simple ordered semigroups, Scientiae Mathematicae Vol. 3, no. 3 (2000), 339-344. [ISSN 1343-9979].

    Zbl. 0971.06012 (Renata Majovska (Hornv Sucha)).

  108.  N. Kehayopulu and M. Tsingelis, On 0-minimal left ideals in ordered      semigroups, Sovremennaja Algebra 5 (25) (2000), 43-46.

  109. N. Kehayopulu, Xie Xiang-Yun, Michael Tsingelis, A characterization of prime and semiprime ideals of semigroups in terms of fuzzy subsets, Soochow Journal of Mathematics 27 (2) (2001), 139-144. Z. MATH 016.60473 Xie Xiang-Yun.

  110. N. Kehayopulu and M. Tsingelis, On prime ideals of groupoids-ordered groupoids, Scient. Math. Japon. Vol. 55, no. 1  (2002), 67-70.Zbl 1002.06011 Summary

  111. N. Kehayopulu and M. Tsingelis, On maximal ideals of ordered semigroups, Scient. Math. Japon.,Vol. 55, no. 1 (2002), 61-65. Zbl 1002.06010 Summary

  112. N. Kehayopulu and M. Tsingelis, Remark on ordered groupoids, Sci. Math. Japon. Vol 5, no. 1 (2002), 71-75. Zbl 1002.06012 Summary

  113. N. Kehayopulu and M. Tsingelis, A note on pseudocongruences in semigroups, Lobachevskii Journal of Math. 11 (2002), 19-21.

  114. N. Kehayopulu and M. Tsingelis, Fuzzy sets in ordered groupoids, Semigroup Forum 65, no. 1 (2002), 128-132. Communicated by M. V. Volkov. Zbl 1006.06008 (From the text)

  115. N. Kehayopulu and M. Tsingelis, On left regular ordered semigroups, Southeast Asian Bull. Math. (Springer-Verlag), 25, no. 5 (2002), 609-615. Zbl 1006.06007 Summary 06F05 (20M17)

  116. M. Arslanov, N. Kehayopulu, A note on minimal and maximal ideals of ordered semigroups, Lobachevski Journ. Math. 11 (2002), 3-6. Zbl 1015.06015

  117. N. Kehayopulu and M. Tsingelis, Α note on semi-pseudoorders in semigroups,         Izvest. Vuzov Math., δεκτό. Lobachevskii J. Math. 13 (2003), 51-56.  Zbl. 1041.06006 (H. Mitsch).

  118. N. Kehayopulu and M. Tsingelis, The embedding of an ordered semigroup into an   le-semigroup, Izvest. Vuzov Math. δεκτό, Lobachevskii J. Math. 13 (2003), 45-50. Zbl  1044.06007 Xie Xiang-Yun

  119. N. Kehayopulu and M. Tsingelis, The embedding of an ordered groupoid into a  poe-groupoid in terms of fuzzy sets, Information Sciences (Elsevier) 152 (2003), 231-236. Zbl 1039.06006  Jan Jakubik (Kosice)

  120. N. Kehayopulu and M. Tsingelis, Adjoining zero to ordered groupoid-semigroups. (Russian) Izv. Vyssh. Uchebn. Zaved. Mat. 2003, no. 9, 28--35; translation in Russian Math. (Iz. VUZ) 47 (2003), no. 9, 25–32 (2004)

  121. N. Kehayopulu, J. S. Ponizovskii, M. Tsingelis, A note on maximal ideals in ordered semigroups, Algebra and Discrete Mathematics 2003, no. 1, 32-35. Zbl. 1035.06003  A. S. Oliynyk (Kyov).

  122. 39) N. Kehayopulu and M. Tsingelis, Ιdeal extension of ordered semigroups, Communications in Algebra 31, no. 10 (2003), 4939-4969 (Dekker). On line publication by Taylor and Francis. MR 2004g: 06014 Frank A. Smith; Zbl 1028.06010 H. Mitsch.

  123. N. Kehayopulu, J.S. Ponizovskii, On weakly prime ideals of ordered semigroups (in Russian), St. Petersburg Math. J. (Translation of Algebra i Analiz), 14, No. 4, 54-62 (in Russian). English translation: Amer. Math. Soc. 14, No. 4 (2003), 577-582. MR 2003h: 06018 Attila Nagy; Zbl 1034.06015 Dimitru Busneag.

  124. N. Kehayopulu and M. Tsingelis, On semigroups which are groups, The Journal of Fuzzy Mathematics (International Fuzzy Mathematics Institute, Los Angeles) Vol. 11, no. 3 (2003), 751-755. Zbl 1047.20048 G. I. Zhitomirskij

  125. N. Kehayopulu, K. P. Shum, Equivalent extensions of ordered sets, Algebras, Groups and Geometries 20, no. 4 (2003), 387-402. MR 2030394; Zbl 1050.06002 Radomir Halas

  126. N. Kehayopulu and K. P. Shum, Ideal extensions of regular  poe-semigroups, Intern. Math. Journal 3, no. 11 (2003), 1267-1277. Communicated by Emil Minchev.

  127. N. Kehayopulu, m-systems and n-systems in ordered semigroups, Quasigroups and Related Systems 11 (2004), 55-58. Zbl 1050.06009 Dimitru Busneag

  128. N. Kehayopulu, Ideal extensions of ordered sets, Intern. J. Math. and Math. Sciences, 2004, no. 53, 2847-2861. [ISSN 0161-1712] . Zblpre02171746 Reviewer Benoit Larose; MR 2145364  Reviewer T. S. Blyth

  129. N. Kehayopulu and M. Tsingelis, On ordered left groups, Lobachevskii Journal of Math., 18 (2005), 131-137. Zbl 1080-06022 Reviewer H. Mitsch

  130. N. Kehayopulu and M. Tsingelis, Noetherian and Artinian ordered semigroups, Int. J. Math. and Math. Sci., 13 (2005), 2041-2051 [ISSN 0161-1712; ISBN 1687-0425. Zbl 1093.06012  Reviewer Jie Meng Xian); MR2177694 (2006h:20091) Reviewer M.K. Sen

  131. N. Kehayopulu, M. Tsingelis, K. P. Shum, Homomorphism theorems in ordered groupoids, Algebras, Groups and Geometries 22, No. 1 (2005), 25-36. MR 2140587; Zbl  1079.06015  (Reviewer Jie Meng).

  132. N. Kehayopulu and M. Tsingelis, Fuzzy bi-ideals in ordered semigroups, Information Sciences 171, no. 1-3 (2005), 13-28. MR 2123810 (2005k: 06036)  Reviewer T.S. Blyth;Zbl 1080.06021  Reviewer Josef Drewniak (Rzeszow)

  133. Ν. Κehayopulu, K. P. Shum, M. Tsingelis, The Rees quotient ordered groupoids, Ital. J. Pure Appl. Math. 17 (2005), 201-206. Zbl 1098.06010 M. V. Volkov

  134. L. Fuchs, N. Kehayopulu, R. Reis and M. Tsingelis, Divisorial elements in ordered groupoids, Semigroup Forum. 71, no. 2 (2005), 188-200. Communicated by L. Marki. ΜR 2184053 20M14(13A15) Reviewer Valentina Barucci; Zbl. 1092.06013 Reviewer Heinz Mitsch (Wien).

    H εργασία ανακοινώθηκε από τον Καθηγητή Fuchs στο AMS Sectional Meeting, 2004 Tallahassee, Florida, March 12-13, 2004. Meeting #994.

  135. Niovi Kehayopulu, Michael Tsingelis, Elton Pasku, An embedding of an ordered groupoid into an le-groupoid, Semigroup Forum 73 , no. 1 (2006), 55-60.  Communicated by M. V. Volkov. Zbl 1110.06018 Reviewer Jiri Rachunek (Olomouc); MR 2277317 (2007j: 06022) Reviewer Aurora del Rio

  136. N. Kehayopulu, J. S. Ponizovskii, K. P. Shum, Retract extensions of ordered sets, Zap. Nauchn. Sem. S.-Peterburg Otdel Mat. Inst. Steklov (POMI) 321 (2005), Vopr. Teor. Predst. Algebr. i Grupp. 12, 205-212, 299-300, translation in J. Math. Sci. (N. Y.) 136 (2006), no. 3, 3946—3950.  [ISSN 0373-2703]. Zbl 1074.06001, Reviewer Jan Jakubik; MR 2138418 (2006d: 06006) Reviewer Boris M. Schein.

  137. M. M. Arslanov, N. Kehayopulu, Weak presentations of computable ordered semigroups. (Russian)  Izv. Vyssh. Uchebn. Zaved. Mat. 2006, no. 3, 3-8; translation in Russian Math. (Iz. VUZ) 50 (2006), no. 3, 1-6.

  138. N. Kehayopulu, M. Tsingelis, Regular ordered semigroups in terms of fuzzy subsets, Information Sciences, 176 (2006), 3675-3693. MR 2007h:06024 Edward C. Mosteig

  139. N. Kehayopulu and M. Tsingelis, Left regular and intra-regular ordered semigroups in terms of fuzzy subsets, Quasigroups Related Systems 14, no. 2 (2006), 169-178. Zbl 1125.06011 Reviewer: Xie Xiang-Yun

  140. N. Kehayopulu, Ideals and Green’s relations in ordered semigroups, Ιnt. J. Math. Math. Sci. Vol. 2006, Arti. ID 61286, 2006, 8 pp. MR 2219191 (Reviewer Young Bae Jun); Zbl 112106014 Reviewer Marius Tarnauceanu (Iasi).

  141. N. Kehayopulu and M. Tsingelis, Fuzzy interior ideals in ordered semigroups, Lobachevskii Journal of Mathematics 21 (2006), 65-71. MR 2220.701 Reviewer C. Mosteig;  Zbl 1120.06013 Reviewer:  Xie-Xiang-Yun (Guangdong).

  142. Ν. Κehayopulu, M. Tsingelis, Decomposition of commutative ordered semigroups into archimedean components, Lobachevskii J. Math. 22 (2006), 27-34 (electronic). Zbl 1120.06014 Reviewer:  Xie-Xiang-Yun (Guangdong).

  143. N. Kehayopulu and M. Tsingelis, Semilattice composition of ordered semigroups            (English,Russian). Russ. Math. 51, No. 3, 25-32 (2007); Russian version Izv. Vyssh. Uchebn. Zaved., Mat. 2007, No. 3, 29-37 (2007). Zbl 1141.06012 Reviewer: Marat M. Arslanov (Kazan) and Niovi Kehayopulu     (Athens)

  144. N. Kehayopulu, M. Tsingelis, On fuzzy ordered groupoids-semigroups, Journal Fuzzy Math. 15, no. 3 (2007), 689-697. MR Reviewer S. Coumaaressane; Zbl 1135.06011 Reviewer Heinz Mitsch (Wien)

  145. N. Kehayopulu, M. Tsingelis, Green’s relations in ordered groupoids in terms of fuzzy subsets, Soochow Journal Math. 33, no. 3 (2007), 383-397. Zbl Heinz Mitsch

  146. N. Kehayopulu, M. Tsingelis, Band congruences in ordered semigroups, Intern. Math. Forum 2, no. 21-24 (2007), 1163-1169. Zbl Heinz Mitsch

  147. N. Kehayopulu, M. Tsingelis, Band congruences of t-archimedean ordered semigroups, Algebra Colloquium 14, no. 4 (2007), 705-712. Communicated by K.P. Shum. Zbl Marcel Wild

  148. Ν. Κehayopulu, M. Tsingelis, CS -indecomposable ordered semigroups. Zap. Nauchn. Sem. S.-Peterburg. Otdel. Mat. Inst. Steklov. (POMI) 343 (2007), Vopr. Teor. Predts. Algebr. i Grupp. 15, 222--232, 275; translation in J. Math. Sci. (N. Y.) 147 (2007), no. 5, 7098–7104.

  149. Ν. Κehayopulu, M. Tsingelis, Fuzzy ideals in ordered semigroups, Quasigroups Related Systems 15, No. 2 (2007), 279-289.  Zbl Zhan Jianming (Enshi)

  150. N. Kehayopulu, Weakly prime and prime fuzzy ideals in ordered semigroups, Lobachevskii J. Math. 27 (2007), 31-40. Zbl Xiang-Yun Xie

  151. N. Kehayopulu, M. Tsingelis, Semilattices of archimedean ordered semigroups, Algebra Colloquim, 15, no. 3 (2008), 527-540. MR Miroslav Haviar; Zbl Heinz Mitsch

  152. K. P. Shum, Pingyu Zhu, N. Kehayopulu, ΙΙΙ-homomorphisms and III-congruences on posets, Discrete Math. 308, no. 21 (2008), 5006-5013. MR Reviewer: Miroslav Haviar; Zbl Radomir Halas (Prostejov)

  153. N. Kehayopulu, M. Tsingelis, Characterization of some types of ordered semigroups in terms of fuzzy sets, Lobachevskii J. Math., 29, no. 1 (2008), 14-20 (Springer). Zbl Heinz Mitsch

  154. Ν. Κehayopulu, M. Tsingelis, Archimedean ordered semigroups as ideal extensions , Semigroup Forum 78, no. 2 (2009), 343-348. Zbl Xiang-Yun Xie

  155. N. Kehayopulu, M. Tsingelis, r-bands of r-archimedean ordered semigroups, Lobachevskii J. Math. 30, no. 2 (2009), 146-153. Zbl Xiang-Yun Xie     

  156. N. Kehayopulu, Ideal extensions of lattices. (Russian) Izv. Vyssh. Uchebn. Zaved. Mat. 2009, no. 2, 46--64; translation in Russian Math. (Iz. VUZ) 53 (2009), no. 2, 41–58. Zbl Grigore Calugareanu

  157. N. Kehayopulu, M. Tsingelis, Fuzzy right, left, quasi-ideals, bi-ideals in ordered semigroups, Lobachevskii J. Math. 30, no. 1 (2009), 17-22. Zbl Zhan Jianming

  158. N. Kehayopulu, M. Tsingelis, Intra-regular ordered semigroups in terms of fuzzy sets, Lobachevskii J. Math. 30, no. 1 (2009), 23-29. Zbl Zhan Jianming

  159. N. Kehayopulu, M. Tsingelis, Ideal extensions of weakly reductive ordered semigroups, Sci. Math. Jpn. 70, no. 3 (2009), 399-406.

  160. N. Kehayopulu, On le-Γ-semigroups, Int. Math. Forum, 4, no. 39 (2009), 1915-1922.      

  161. N. Kehayopulu, On prime, weakly prime ideals in po-Γ-semigroups, Lobachevskii J. Math, 30, no. 4 (2009), 257—262.

  162. Embedding of some ordered integral domains into ordered fields, Lobachevskii J. Math. 30, no. 4 (2009), 269—273. MR Warren Wm. McGovern

  163. N. Kehayopulu. M. Tsingelis, Embedding an ordered semigroup into a translational hull, Sci. Math. Jpn. 72, no. 3 (2010), 277-281. MR Kostaq Hila; Zbl Janis Cirulis

  164. N. Kehayopulu, M. Tsingelis, Free ordered semigroups, Sci. Math. Jpn. 72, no. 2 (2010), 147-155. MR Boris Schein; Zbl Xiang-Yun Xie

  165. N. Kehayopulu, M. Tsingelis, On free ordered semigroups, Sci. Math. Jpn. 71, no. 2 (2010), 223-229. Zbl Marcel Wild

  166. N. Kehayopulu, On ordered Γ-semigroups, Sci. Math. Jpn. 71, no. 2 (2010), 179-185.

  167. N. Kehayopulu, M. Tsingelis, The set of regular elements in ordered semigroups, Sci. Math. Jpn. 72, no. 1 (2010), 61-66. Zbl Xiang-Yun Xie

  168. N. Kehayopulu, M. Tsingelis, On some regular subsemigroups of semigroups, Sci. Math. Jpn. 72, no. 2 (2010), 117-120.

  169. N. Kehayopulu, Retract extensions of lattices. (Russian) Izv. Vyssh. Uchebn. Zaved. Mat. 2011, no. 3, 20--29; translation in Russian Math. (Iz. VUZ) 55 (2011), no. 3, 17–25. Zbl Grigore Calugareanu

  170. N. Kehayopulu, On regular duo po-Γ-semigroups, Mathematica Slovaca 61, no. 6 (2011), 871-884. MR Afrodita Iorgulescu

  171. N. Kehayopulu, M. Tsingelis, Regularity in ordered semigroups, Sci. Math. Jpn. 73, no. 1 (2011), 11-17. MR Kostaq Hila; Zbl Janis Cirulis (Riga)

  172. N. Kehayopulu, M. Tsingelis, On ordered semigroups which are complete chains of semigroups, Sci. Math. Jpn. 73, no. 2-3 (2011), 113-115. Zbl Janis Cirulis

  173. N. Kehayopulu, M. Tsingelis, g-congruences on semigroups, ordered semigroups, Int. J. Algebra 5, no. 21-24 (2011), 1189-1194. Zbl Janis Cirulis

  174. N. Kehayopulu, M. Tsingelis, Ordered semigroups in which the left ideals are intra-regular semigroups, Int. J. Algebra 5, no. 29-32 (2011), 1533-1541. Zbl Janis Cirulis

  175. N. Kehayopulu, On ordered fuzzy Γ-semigroups, Quasigroups Related Systems 19, no. 2 (2011), 227-238.

  176. N. Kehayopulu, Ordered semigroups whose elements are separated by prime ideals, Math. Slovaca 62, no. 3 (2012), 417-424.

  177. N. Kehayopulu, M. Tsingelis, Ordered semigroups which are both  right commutative and right cancellative, Semigroup Forum 84, no. 3 (2012), 562-568. Zbl Janis Cirulis

  178. N. Kehayopulu, M. Tsingelis, Decomposition of some types of ordered semigroups, Proceedings of the International Conference on Algebra 2010, 381-389, World Sci. Publ., Hackensack, NJ, 2012.

  179. N. Kehayopulu, Left regular ordered semigroups in which the fuzzy left ideals are two-sided, Int. J. Algebra 6, no. 9-12 (2012), 493-499. Zbl Xiang-Yun Xie (Guangdong)

  180. N. Kehayopulu, Characterization of left quasi-regular and semisimple ordered semigroups in terms of fuzzy sets, Int. J. Algebra 6, no. 13-16 (2012), 747-755. Zbl Xiang-Yun Xie

  181. N. Kehayopulu, M. Tsingelis, On fuzzy ordered semigroups, Quasigroups Related Systems 20, no. 1 (2012), 61-70.

  182. N. Kehayopulu, Left quasi-regular and intra-regular ordered semigroups using fuzzy ideals,  Quasigroups Related Systems 20, no. 2 (2012), 239-249. Zbl Xiang-Yun Xie

  183.  N. Kehayopulu, On fuzzy ordered semigroups, Quasigroups Related Systems 20, no. 2 (2012), 251-256.

  184. N. Kehayopulu, M. Tsingelis, Semigroups actions on ordered groupoids, Math. Slovaca 63, no. 1 (2013), 41-52.

  185. N. Kehayopulu, On semisimple and left quasi-regular elements of ordered semigroups, J. Math. Comput. Sci. 3, no. 1 (2013), 207-215.

  186. N. Kehayopulu, On fuzzy ordered semigroups, J. Math. Comput. Sci. 3, no. 2 (2013), 641-654.

  187. N. Kehayopulu, Intra-regular and completely regular fuzzy ordered semigroups, J. Math. Comput. Sci. 3, no. 4 (2013), 929-944.

  188. N. Kehayopulu, M. Tsingelis, On kernel of ordered semigroups –a corrigendum, Commun. Korean Math. Soc. 28, no. 2 (2013), 225-229.

  189. N. Kehayopulu, M. Tsingelis, On ordered semigroups which are semilattices of left simple semigroups, Math. Slovaca 63, no. 3 (2013), 411-416.

  190. N. Kehayopulu, On bi-ideals of ordered Γ-semigroups – a corrigendum of the paper published in Hacettepe J. Mat. Stat. 42, no. 5 (2013), 559-567.

  191. N. Kehayopulu, M. Tsingelis, On ordered semigroups which are semilattices of simple and regular semigroups, Comm. Algebra 41, no. 9 (2013), 3252-3260. Zbl Dimitru Busneag

  192. N. Kehayopulu, Intra-regular, left quasi-regular and semisimple fuzzy ordered semigroups, Quasigroups Related Systems 21, no. 1 (2013), 91-96. Zbl Lavinia Ciungu (Craiova)

  193. N. Kehayopulu, Green’s relations and the relation {\cal N} in Γ-semigroups, , Quasigroups Related Systems 22, no. 1 (2014), 89-96.

  194. N. Kehayopulu, M. Tsingelis, On left regular and intra-regular ordered semigroups, Math. Slovaca 64, no. 5 (2014), 1123-1134.

  195. N. Kehayopulu, On the paper “On Green’s relations, $2^0$-regularity and quasi-ideals in Γ-semigroups by K. Hila and J. Dine published in Acta Math. Sinica (English Series) 29(3)(2013), 609-624”, Int. Journal Algebra 8, no. 6 (2014), 277-279.
    See also N. Kehayopulu, On the paper “On Green’s relations, $2^0$-regularity and Quasi-ideals in Γ-semigroups”, ArXiv: 1401.7531.

  196. N. Kehayopulu, M. Tsingelis, On the paper “Generalized ideal elements in le-semigroups by K. Hila and E. Pisha published in Commun. Korean Μath. Soc. 26(3)(2011), 373-384”, Int. J. Algebra 8, no. 7 (2014), 321-328.
    See also N. Kehayopulu, M. Tsingelis, Comment on “Generalized ideal elements in le-Γ-semigroups, arXiv: 1402.3455.

  197. N. Kehayopulu, Comment on “Filtres in ordered Γ-semigroups”, arXiv :1406.6682.

  198. N. Kehayopulu, On left regular Γ-semigroups, Int. J. Algebra 8, no. 8 (2014), 389-394. 

  199. N. Kehayopulu, On strongly regular ordered Γ-semigroups, Quasigroups Related Systems 22, no. 2 (2014), 247-254.

  200. N. Kehayopulu, M. Tsingelis, Left strongly archimedean ordered semigroups, Semigroup Forum DOI 10.1007/s00233-014-9672-2, appeared online

  201. N. Kehayopulu, On fuzzy po-Γ-semigroups, Armen. J. Math. 6, no. 2 (2014), 43-52.
  202. Comment "On dual ordered semigroups", arXiv: 1510.02326.

----------------------------------------------------------------------------------------------------------------------------------------
March 15, 2021
I add my last publications
203  N. Kehayopulu, Lattice ordered semigroups and Γ-hypersemigroups, Turkish J. Math. 44, no. 5 (2020, 1835-1851.
204  N. Kehayopulu, On regular hypersemigroups, Eur. J. Pure Appl. Math. 13, no 2 (2020), 346-350.
205  N. Kehayopulu, Erratum to: "Applications of (m,n)-Γ-hyperideals in characterization of LA-Γ-semihypergroups" by Abul Basar, Discuss. Math. Gen. Algebra Appl. 40, no.  1 (2020), 135-138.
206  N. Kehayopulu, Erratum to "Study on quasi-Γ-hyperideals in Γ-semihypergroups, Turkish J. Math. 44, no. 3 (2020), 957-959.
207  On the paper "On hyperideals of ordered semihypergroups" by Ze Gu in Ital. J. Pure Appl. Math., Eur. J. Pure Appl. Math. 12, no. 4 (2019), 1771-1778.

  1. test\\\
  2. test