TY - JOUR ID - 5187 TI - On Closed Homotypical Varieties of Semigroups JO - Journal of Algebra and Related Topics JA - JART LA - en SN - 2345-3931 AU - Abbas, Sh. AU - Ashraf, W. AU - Rafiquee, N. Noor AD - Department of Mathematics, Aligarh Muslim University, Aligarh, India Y1 - 2021 PY - 2021 VL - 9 IS - 2 SP - 83 EP - 95 KW - Zigzag equations KW - Homotypical KW - variety KW - Identity and Closed DO - 10.22124/jart.2021.18949.1255 N2 - It is known that all subvarieties of the variety of all semigroups are not absolutely closed. So, we determine some closed homotypical varieties of semigroups determined by the identities  $axy=x^2ayx$, $axy=xa^2ya$, $axy=yay^2x$, $axy=xaya^2$, $axy=y^2ayx$ and $axy=xayx^2$. UR - https://jart.guilan.ac.ir/article_5187.html L1 - https://jart.guilan.ac.ir/article_5187_d3e0ea1a8a98a336c730ae64260a828e.pdf ER -