A note on square extensions of bands.
A characterization of groups in the class of *-regular semigroups.
On subdirect decomposition and varieties of some rings with involution. II.
Undecidable varieties with solvable word problems. III (a semigroup variety).
A survey of algebra of tournaments.
On subdirect decomposition and varieties of some rings with involution.
Decidability problems for the variety generated by tournaments.
Matrix identities involving multiplication and transposition
We study matrix identities involving multiplication and unary operations such as transposition or Moore–Penrose inversion. We prove that in many cases such identities admit no finite basis.
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