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Umar, Abdullahi

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Author ID: umar.abdullahi Recent zbMATH articles by "Umar, Abdullahi"
Published as: Umar, A.; Umar, Abdullahi
Homepage: http://www.ku.ac.ae/pages/abdullahi-umar
External Links: MGP · Wikidata
Documents Indexed: 33 Publications since 1992

Publications by Year

Citations contained in zbMATH

23 Publications have been cited 100 times in 67 Documents Cited by Year
On the semigroups of order-decreasing finite full transformations. Zbl 0746.20048
Umar, Abdullahi
21
1992
Combinatorial results for semigroups of order-preserving full transformations. Zbl 1098.20049
Laradji, A.; Umar, A.
11
2006
Combinatorial results for semigroups of order-preserving partial transformations. Zbl 1057.20046
Laradji, A.; Umar, A.
9
2004
On certain finite semigroups of order-decreasing transformations. I. Zbl 1072.20080
Laradji, A.; Umar, A.
7
2004
Semigroups of order-decreasing transformations: The isomorphism theorem. Zbl 0858.20056
Umar, Abdullahi
6
1996
On the semigroups of partial one-to-one order-decreasing finite transformations. Zbl 0789.20075
Umar, Abdullahi
6
1993
On the semigroup of partial isometries of a finite chain. Zbl 1339.20058
Al-Kharousi, F.; Kehinde, R.; Umar, A.
5
2016
On the number of nilpotents in the partial symmetric semigroup. Zbl 1069.20061
Laradji, A.; Umar, A.
4
2004
On a certain subsemigroup of the bicyclic semigroup. Zbl 0869.20042
Makanjuola, S. O.; Umar, A.
4
1997
Combinatorial results for certain semigroups of partial isometries of a finite chain. Zbl 1296.05203
Al-Kharousi, F.; Kehinde, R.; Umar, A.
3
2014
Combinatorial results for the symmetric inverse semigroup. Zbl 1131.20049
Laradji, A.; Umar, A.
3
2007
On certain infinite semigroups of order-decreasing transformations. I. Zbl 0883.20026
Umar, Abdullahi
3
1997
On the ranks of certain finite semigroups of order-decreasing transformations. Zbl 0844.20050
Umar, Abdullahi
3
1996
A class of quasi-adequate transformation semigroups. Zbl 0828.20066
Umar, Abdullahi
3
1994
A countable family of finitely presented infinite congruence-free monoids. Zbl 1363.20044
Al-Kharousi, Fatma; Cain, Alan J.; Maltcev, Victor; Umar, Abdullahi
2
2015
Combinatorial results for semigroups of order-decreasing partial transformations. Zbl 1064.05016
Laradji, A.; Umar, A.
2
2004
Some remarks about Fibonacci groups and semigroups. Zbl 0904.20021
Umar, Abdullahi
2
1997
Presentations for subsemigroups of \(PD_n\). Zbl 07088794
Umar, Abdullahi
1
2019
Presentation for the partial dual symmetric inverse monoid. Zbl 1322.20052
Kudryavtseva, Ganna; Maltcev, Victor; Umar, Abdullahi
1
2015
The solution of a recursive sequence arising from a combinatorial problem in botanical epidemiology. Zbl 1274.92048
AlSharawi, Z.; Burstein, A.; Deadman, M.; Umar, A.
1
2013
Combinatorial results for semigroups of orientation-preserving partial transformations. Zbl 1226.20052
Umar, A.
1
2011
Asymptotic results for semigroups of order-preserving partial transformations. Zbl 1087.20043
Laradji, A.; Umar, A.
1
2006
Enumeration of certain finite semigroups of transformations. Zbl 0956.20052
Umar, Abdullahi
1
1998
Presentations for subsemigroups of \(PD_n\). Zbl 07088794
Umar, Abdullahi
1
2019
On the semigroup of partial isometries of a finite chain. Zbl 1339.20058
Al-Kharousi, F.; Kehinde, R.; Umar, A.
5
2016
A countable family of finitely presented infinite congruence-free monoids. Zbl 1363.20044
Al-Kharousi, Fatma; Cain, Alan J.; Maltcev, Victor; Umar, Abdullahi
2
2015
Presentation for the partial dual symmetric inverse monoid. Zbl 1322.20052
Kudryavtseva, Ganna; Maltcev, Victor; Umar, Abdullahi
1
2015
Combinatorial results for certain semigroups of partial isometries of a finite chain. Zbl 1296.05203
Al-Kharousi, F.; Kehinde, R.; Umar, A.
3
2014
The solution of a recursive sequence arising from a combinatorial problem in botanical epidemiology. Zbl 1274.92048
AlSharawi, Z.; Burstein, A.; Deadman, M.; Umar, A.
1
2013
Combinatorial results for semigroups of orientation-preserving partial transformations. Zbl 1226.20052
Umar, A.
1
2011
Combinatorial results for the symmetric inverse semigroup. Zbl 1131.20049
Laradji, A.; Umar, A.
3
2007
Combinatorial results for semigroups of order-preserving full transformations. Zbl 1098.20049
Laradji, A.; Umar, A.
11
2006
Asymptotic results for semigroups of order-preserving partial transformations. Zbl 1087.20043
Laradji, A.; Umar, A.
1
2006
Combinatorial results for semigroups of order-preserving partial transformations. Zbl 1057.20046
Laradji, A.; Umar, A.
9
2004
On certain finite semigroups of order-decreasing transformations. I. Zbl 1072.20080
Laradji, A.; Umar, A.
7
2004
On the number of nilpotents in the partial symmetric semigroup. Zbl 1069.20061
Laradji, A.; Umar, A.
4
2004
Combinatorial results for semigroups of order-decreasing partial transformations. Zbl 1064.05016
Laradji, A.; Umar, A.
2
2004
Enumeration of certain finite semigroups of transformations. Zbl 0956.20052
Umar, Abdullahi
1
1998
On a certain subsemigroup of the bicyclic semigroup. Zbl 0869.20042
Makanjuola, S. O.; Umar, A.
4
1997
On certain infinite semigroups of order-decreasing transformations. I. Zbl 0883.20026
Umar, Abdullahi
3
1997
Some remarks about Fibonacci groups and semigroups. Zbl 0904.20021
Umar, Abdullahi
2
1997
Semigroups of order-decreasing transformations: The isomorphism theorem. Zbl 0858.20056
Umar, Abdullahi
6
1996
On the ranks of certain finite semigroups of order-decreasing transformations. Zbl 0844.20050
Umar, Abdullahi
3
1996
A class of quasi-adequate transformation semigroups. Zbl 0828.20066
Umar, Abdullahi
3
1994
On the semigroups of partial one-to-one order-decreasing finite transformations. Zbl 0789.20075
Umar, Abdullahi
6
1993
On the semigroups of order-decreasing finite full transformations. Zbl 0746.20048
Umar, Abdullahi
21
1992

Citations by Year

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