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Corrections and Extensions in Left and Right Almost Semigroups

Author(s)
Nisar Ahmad Institute of Numerical Sciences, Kohat University of Science and Technology, Pakistan
Syed Aleem Shah Institute of Numerical Sciences, Kohat University of Science and Technology, Pakistan
Wali Khan Mashwani Institute of Numerical Sciences, Kohat University of Science and Technology, Pakistan
Nasim Ullah Institute of Numerical Sciences, Kohat University of Science and Technology, Pakistan
Abstract
In this paper we elaborated the concept that on what conditions left almost semigroup (LA-Semigroup), right almost semigroup (RA-Semigroup) and a groupoid become commutative and further extended these results on medial, LA-Group and RA-Group. We proved that the relation of LA-Semigroup with left double displacement semigroup (LDD-semigroup), RA-Semigroup with left double displacement semigroup (RDD-semigroup) is only commutative property. We highlighted the errors in the recently developed results on LA-Semigroup and semigroup [17, 1, 18] and proved that example discussed in [18] is semigroup with left identity but not paramedial. We extended results on locally associative LA-Semigroup explained in [20, 21] towards LA-Semigroup and RA-Semigroup with left zero and right zero respectively. We also discussed results on n-dimensional LA-Semigroup, n-dimensional RASemigroup, non commutative finite medials with three or more than three left or right identities and finite as well as infinite commutative idempotent medials not studied in literature.
Publication Details
Page(s) 475-496
Published Journal: Punjab University Journal of Mathematics, Volume: 53, Issue: 7, Year: 2021

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Keywords
RA-Semigroup, LA-Semigroup., Semigroup, Medial, Paramedial
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