papers
Publications (8)
math.GR2011
On the semigroup of order-decreasing partial isometries of a finite chain
R. Kehinde, S. O. Makanjuola, A. Umar
math.GR2018
On certain semigroups of partial contractions of a finite chain
A. Umar, M. M. Zubairu
math.GR2017
Combinatorial results for certain semigroups of order-decreasing partial isometries of a finite chain
F. Al-Kharousi, R. Kehinde, A. Umar
math.GR2018
Regularity and Green's relations for the semigroup of partial contractions of a finite chain
B. Ali, A. Umar, M. M. Zubairu
math.CO2013
Constructing Even Order Magic Squares By Consecutive Numbering
A. M. Ibrahim, H. M. Jibril, A. Umar
math.GR2018
On certain semigroups of full contractions of a finite chain
A. Umar, M. M. Zubairu
math.CO2013
Lattice Paths and Order-preserving Partial Transformations
A. Laradji, A. Umar
math.CO2013
Combinatorial results for certain semigroups of order-preserving full contraction mappings of a finite chain
A. D. Adeshola, A. Umar