The monoid of order isomorphisms of principal filters of a power of the positive integers

Oleg Gutik, Taras Mokrytskyi

Let $n$ be any positive integer and $\mathcal{I}\mathcal{P}\mathcal{F}({\mathbb{N}}^n)$ be the semigroup of all order isomorphisms between principal filters of the $n$-th power of the set of posit…