We show that all subvarieties of left regular bands are closed in the variety of all bands. We
also show that all subvarieties of left seminormal bands are saturated in the variety of all …

We show that all subvarieties of the variety of rectangular bands are closed in the variety of
all bands. Further, we show that the variety of regular bands is closed. Next, we introduce …

SPECIAL SEMIGROUP AMALGAMS OF QUASI UNITARY SUBSEMIGROUPS AND OF QUASI
NORMAL BANDS Page 1 Asian-European Journal of Mathematics Vol. 6, No. 1 (2013) 1350010 …

The aim of this paper is to determine several saturated classes of structurally regular
semigroups. First, we show that structurally (n, m)-regular semigroups are saturated in a …

It is well known that every subvariety of the variety of semigroups need not be absolutely
closed. Thus, identifying those subvarieties that are closed in themselves or in larger …

In this paper we study epimorphisms, dominions and related properties for some classes of
structurally (n, m)-regular semigroups for any pair (n, m) of positive integers. In Section 2 …

We show that all subvarieties of the variety of rectangular bands are closed in the variety of $
n $-nilpotent extension of bands. Ahanger, Nabi and Shah in [1] have proved that the variety …

We show that for each n≥ 2∈ N, the varieties V n=[x 1 x 2 x 3= x 1 nxi 1 xi 2 xi 3] where i is
any non-trivial permutation of {1, 2, 3} are closed. Further, we show that for each n∈ N, the …

Epimorphisms Amalgams and Po-Unitary Pomonoids Next Article in Journal Influence of a
Given Field of Temperature on the Blood Pressure Variation: Variational Analysis …

Some Closed Varieties of Semigroups Page 1 Palestine Journal of Mathematics Vol. 12(3)(2023)
, 52–64 © Palestine Polytechnic University-PPU 2023 Some Closed Varieties of …