1 problem

0 votes0 replies2 views
Conjecture on the upper rank of the endomorphism semigroup of a Brandt semigroup
Let $B_n$ be the Brandt semigroup, and let ${\rm End}(B_n)$ denote its semigroup of endomorphisms. Write $r_4(S)$ for the upper rank of a semigroup $S$ . Upper-rank conjecture. For…
Conjectureopenbrand-semigroups endomorphism-semigroups semigroup-theoryarXiv posted 2 days ago

Conjecture on the upper rank of the endomorphism semigroup of a Brandt semigroup