F. Al-Kharousi

activity

20102025

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

2 citations · 2 across the 8 of their papers we have counts for

collaborators

8 papers

math.GR2025

The monoid of monotone and decreasing partial transformations on a finite chain

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

In this article, we consider the monoid of all monotone and order-decreasing partial transformations denoted as $D O RP_{n}$ on an $n$ ordered chain $[n] = {1, \dots, n}$ ,…

math.GR2025

On the small Schröder semigroup $SS_{n}^{'}$

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

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

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…

math.CO2022

Combinatorial results for order-preserving partial injective contraction mappings

Bayo Musa Ahmed, Nadia Aldhamri, Fatma Al-Kharousi +2

Let $I_{n}$ be the symmetric inverse semigroup on $X_{n} = {1, 2, \dots, n}$ . Let $O C I_{n}$ be the subsemigroup of $I_{n}$ consisting of all order-preser…

math.GR2017

Combinatorial results for certain semigroups of order-decreasing partial isometries of a finite chain

F. Al-Kharousi, R. Kehinde, A. Umar

Let $I_{n}$ be the symmetric inverse semigroup on $X_{n} = {1, 2, \dots, n}$ and let $DDP_{n}$ and $O DDP_{n}$ be its subsemigroups of order-decreasing partial isom…

The monoid of monotone and decreasing partial transformations on a finite chain

On the small Schröder semigroup SSn′​

On injective partial Catalan monoids

On the algebraic structure of the Schröder monoid

Combinatorial results for order-preserving partial injective contraction mappings

Combinatorial results for certain semigroups of order-decreasing partial isometries of a finite chain

On the small Schröder semigroup $SS_{n}^{'}$