The lattice of semigroup varieties.
p. 1
Semilattices of bisimple inverse semigroups.
p. 44
On some classes of H-semigroups.
p. 49
Baer extensions of rings and Stone extensions of semigroups.
p. 55
Sur les demi-groupes réticulés et les O-demi-groupes.
p. 64
A note on the embedding of topological semigroups.
p. 71
A characterization of a free elementary semigroup.
p. 76
Semilattices which are embeddable in a product of min intervals.
p. 80
On bands, free bands and identities.
p. 83
An analogue of Litoff's Theorem.
p. 86
A remark on intra-regular semigroups.
p. 89
Any O-simple dual semigroup is completely O-simple.
p. 90
Perfect monoids.
p. 95
A semigroup in function algebra.
p. 119
Commutative semigroups having greatest regular images.
p. 130
Théorie des classes dans un demi-groupe involutif.
p. 138
O-simple strictly regular semigroups.
p. 154
The quasi-uniserial semigroups without zero, their arithmetics and their algebras.
p. 162
The semigroup of semigroup extensions.
p. 173
On commutative exclusive semigroups.
p. 181
Representations of semigroups by linear transformations, Part I.
p. 189
On some classes of regular semigroups.
p. 264
Über den Untergruppenverband der symmetrischen Gruppe, den Unterhalbgruppenver-band der symmetrischen Halbgruppe und den Unter-algebrenverband der Postchen Algebra.
p. 271
On Kim's conjecture.
p. 281
Bibliographical Items
p. 282
Representations of semigroups by linear transformations,Part II..
p. 283
A generalization of the Rees Theorem to a class o£ regular semigroups.
p. 321
An embedding theorem for weakly inverse semigroups.
p. 332
Extensions of ordered semigroups.
p. 336
A construction principle and compact Clifford semigroups.
p. 343
Semisimplicity and von Neumann's regularity.
p. 354
Completely O-simple multiplicative ideals of rings.
p. 362
Characterization of bands satisfying no non-trivial identity.
p. 371
Erratum to
p. 376