A. Umar

activity

20102025

most citedA countable family of finitely presented infinite congruence-free monoids

2 citations · 4 across the 14 of their papers we have counts for

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Showing 2024 · math.GRShow all

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math.GR2024

On injective partial Catalan monoids

F. S. Al-Kharousi, A. Umar, M. M. Zubairu

Let $[n]$ be a finite chain ${1, 2, \dots, n}$ , and let $I C_{n}$ be the semigroup consisting of all isotone and order-decreasing injective partial transformations on $…

math.GR2024

On the algebraic structure of the Schröder monoid

Muhammad Mansur Zubairu, Abdullahi Umar, Fatma Salim Al-Kharousi

Let $[n]$ be a finite chain ${1, 2, \dots, n}$ , and let $LS_{n}$ be the semigroup consisting of all isotone and order-decreasing partial transformations on $[n]$ . More…