On groups in varieties of semigroups.
On the ...-class of a product.
On general linear semigroups.
On generating regular elements in the semigroup of binary relations.
Orders of subsemigroups of Tn.
The average rank of a product of transformations.
Graph Monoids.
The Williams conjecture is false for irreducible subshifts.
The Williams conjecture is false for irreducible subshifts.
Inert actions on periodic points.
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