1. On a pull-back diagram for orthodox semigroups

   • Mária B. Szendrei

   Research Article 01 December 1980 Pages: 1 - 10

   

2. Varietes de langages et monoide des parties

   • Jean-Eric Pin

   Research Article 01 December 1980 Pages: 11 - 47

   

3. Topological semilattices with enough closed subsemilattices to separate points

   • James W. Stepp

   Research Article 01 December 1980 Pages: 49 - 54

4. A general purity law for convolution semigroups with discrete Lévy measure

   • Arnold Janssen

   Research Article 01 December 1980 Pages: 55 - 71

5. On the quasivaieties generated by finite semigroups

   • M. V. Sapir

   Research Article 01 December 1980 Pages: 73 - 88

6. Another semigroup characterization of the simple closed curve

   • K. D. Magill Jr.
   • S. Subbiah

   Short Note 01 December 1980 Pages: 89 - 90

7. Strong endomorphisms of π-connected automata

   • André D. Paradis
   • Gabriel Thierrin

   Short Note 01 December 1980 Pages: 91 - 93

8. Bibliographical items

   Legacy 01 December 1980 Pages: 94 - 94

9. Generalized Green's theories

   • C. E. Clark
   • J. H. Carruth

   Research Article 01 December 1980 Pages: 95 - 127

10. Primary ideals in semigroups

    • A. Anjaneyulu

    Research Article 01 December 1980 Pages: 129 - 144

11. On E-m semigroups which are bands of t-archimedean semigrops

    • Ada Varisco

    Research Article 01 December 1980 Pages: 145 - 149

12. The free algebra in the variety generated by quasi-trivial semigroups

    • Helmut Länger

    Research Article 01 December 1980 Pages: 151 - 156

13. Purity in the category of M-sets

    • Peeter Normak

    Research Article 01 December 1980 Pages: 157 - 170

14. The finiteness of a base of identities for five-element monoids

    • A. V. Tishchenko

    Research Article 01 December 1980 Pages: 171 - 186

15. Semigroup literature

    • Virgil P. Diodato

    Short Note 01 December 1980 Pages: 187 - 188

16. Lattice isomorphisms of commutative relatively free semigroups

    • A. J. Ovsyannikov

    Research Article 01 December 1980 Pages: 189 - 225

17. Orthodox semigroups

    • P. S. Venkatesan

    Research Article 01 December 1980 Pages: 227 - 231

18. A new notion in the theory of semigroup

    • O. Grošek
    • L. Satko

    Research Article 01 December 1980 Pages: 233 - 240

19. Semigroups with [x][y]=[y][x]

    • E. D. DeVun

    Research Article 01 December 1980 Pages: 241 - 253

20. Embedding inverse semigroups in coset semigroups

    • D. B. McAlister

    Research Article 01 December 1980 Pages: 255 - 267

21. On quasi-transitive semigroup actions

    • Kripasindhu Sikdar

    Research Article 01 December 1980 Pages: 269 - 280

22. Factorizable as a finiteness condition

    • H. D'Alarcao

    Short Note 01 December 1980 Pages: 281 - 282

23. Announcement

    Announcement 01 December 1980 Pages: 283 - 283

24. Subsemigroups of the finite complexes of a group

    • F. D. Pedersen
    • Walter S. Sizer

    Research Article 01 December 1980 Pages: 285 - 292

25. A partially ordered space which is not a priestley space

    • Albert Stralka

    Research Article 01 December 1980 Pages: 293 - 297

26. Zur Theorie der Stetigen Teilbarkeitshalbgruppen

    • Bruno Bosbach

    Research Article 01 December 1980 Pages: 299 - 317

27. Archimedische Teilbarkeitshalbgruppen und quaderalgebren

    • Bruno Bosbach

    Research Article 01 December 1980 Pages: 319 - 334

28. A band generated by two semilattices is regular

    • Peter R Jones

    Research Article 01 December 1980 Pages: 335 - 341

29. The Hopf property and \(\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle\thicksim}$}}{K} \)-free products of semigroups

    • Peter R Jones

    Research Article 01 December 1980 Pages: 343 - 368

30. Convolutions of probability measures on semigroups

    • Franz Kinzl

    Research Article 01 December 1980 Pages: 369 - 383

31. Semigroups and lattices

    • Johnny A. Johnson
    • John S. Rankin

    Short Note 01 December 1980 Pages: 385 - 386

32. A note on endomorphism semigroups

    • Andrew Foster

    Short Note 01 December 1980 Pages: 387 - 389

33. Announcement

    Announcement 01 December 1980 Pages: 390 - 390