Semilattice Indecomposable Finite Semigroups With Large Subsemilattices

Márton Zubor

In this paper we show that if $Y$ is a subsemilattice of a finite semilattice indecomposable semigroup $S$ then $|Y|\le 2\lfloor \frac{|S|-1}{4}\rfloor +1$. We also char…