Hereditaril yfinitel ybase dmonoid so fextensive transformations
Hyun Ho Lee · 2009
It is shown that the monoid En of extensive transformations of a chain of order n is hereditarily finitely based if and only if n ≤ 3. It follows that the submonoid OEn of order-preserving transformations in En is also hereditarily finitely based if and only if n ≤ 3.