On expressing commutativity by finite Church-Rosser presentations : a note on commutative monoids
On extending endomorphisms to automorphisms.
On extensions of partial -operators
On extensions onto sub-semigroups of semigroups with two generators.
On factor S-sets of monoids modulo submonoids.
On factorisations onto the Bicyclic semigroup.
On finite J-trivial monoids.
On finite lattices which are embeddable in subsemigroup lattices.
On finitely generated commutative semigroups
On finitely generated monoids of matrices with entries in
On finitely generated submonoids of N k
On finitely generated subsemigroups of a free semigroup.
On finiteness conditions for Rees matrix semigroups
Let be a Rees matrix semigroup where is a semigroup, and are index sets, and is a matrix with entries from , and let be the ideal generated by all the entries of . If has finite index in , then we prove that is periodic (locally finite) if and only if is periodic (locally finite). Moreover, residual finiteness and having solvable word problem are investigated.
On Free Commutative Groupoids
On free commutative groupoids.
On free inverse monoid languages
On free products of bands.
On free products of bicyclic monoids.
On free subsemigroups.
On full transformation semigroups.