ON CLOSED HOMOTYPICAL VARIETIES OF SEMIGROUPS-۲

In this paper we extended the results of paper\linebreak ``On Closed Homotypical Varieties of Semigroups" and have shown that the homotypical varieties of semigroups defined by the identities  axy=x^nayx, axy=xa^nya[axy=yay^nx],axy=xaya^n[axy=y^nayx] and axy=xayx^n are closed in itself, where (n \in \mathbb{N}).

کلیدواژه ها:

Zigzag equations ، Homotypical ، Variety ، Identity and Closed