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Professor Abdullahi Umar
Professor Abdullahi Umar
Department of Mathematics, Khalifa University of Science and
Verified email at ku.ac.ae
Title
Cited by
Cited by
Year
On the semigroups of order-decreasing finite full transformations
A Umar
Proceedings of the Royal Society of Edinburgh Section A: Mathematics 120 (1 …, 1992
1281992
Combinatorial results for semigroups of order-preserving partial transformations
A Laradji, A Umar
Journal of Algebra 278 (1), 342-359, 2004
662004
Combinatorial results for semigroups of order-preserving full transformations
A Laradji, A Umar
Semigroup Forum 72, 51-62, 2006
622006
On certain finite semigroups of order-decreasing transformations I
A Laradji, A Umar
Semigroup Forum 69, 184-200, 2004
562004
On the semigroups of partial one-to-one order-decreasing finite transformations
A Umar
Proceedings of the Royal Society of Edinburgh Section A: Mathematics 123 (2 …, 1993
511993
On the number of nilpotents in the partial symmetric semigroup
A Laradji, A Umar
Communications in Algebra 32 (8), 3017-3023, 2004
302004
On the ranks of certain finite semigroups of order-decreasing transformations
A Umar
Portugaliae Mathematica 53 (1), 23-34, 1996
291996
Combinatorial results for the symmetric inverse semigroup
A Laradji, A Umar
Semigroup Forum 75, 221-236, 2007
282007
Combinatorial results for semigroups of order-decreasing partial transformations
A Laradji, A Umar
J. Integer Seq 7 (3), 2004
272004
On the semigroup of partial isometries of a finite chain
F Al-Kharousi, R Kehinde, A Umar
Communications in Algebra 44 (2), 639-647, 2016
262016
Some combinatorial problems in the theory of symmetric inverse semigroups
A Umar
Algebra and Discrete Mathematics 9 (2), 115-126, 2010
252010
Semigroups of order-decreasing transformations: the isomorphism theorem
A Umar
Semigroup Forum 53 (2), 220-224, 1996
251996
Combinatorial results for certain semigroups of order-preserving full contraction mappings of a finite chain
AD Adeshola, A Umar
JCMCC 106, 37-49, 2018
24*2018
On certain infinite semigroups of order-decreasing transformations I
A Umar
Communications in Algebra 25 (9), 2987-2999, 1997
231997
Some combinatorial problems in the theory of partial transformation semigroups
A Umar
Algebra and discrete mathematics, 110-135, 2014
202014
Semigroups of order-decreasing transformations
A Umar
University of St Andrews, 1992
201992
Combinatorial results for certain semigroups of partial isometries of a finite chain.
F Al-Kharousi, R Kehinde, A Umar
Australas. J Comb. 58, 365-375, 2014
182014
A class of quasi-adequate transformation semigroups
A Umar
Portugaliae Mathematica 51 (4), 553-570, 1994
161994
Enumeration of certain finite semigroups of transformations
A Umar
Discrete mathematics 189 (1-3), 291-297, 1998
131998
On certain semigroups of full contractions of a finite chain
A Umar, MM Zubairu
arXiv preprint arXiv:1804.10057, 2018
102018
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Articles 1–20