Author

AFRICAN RESEARCH NEXUS

SHINING A SPOTLIGHT ON AFRICAN RESEARCH

Umar, Abdullahi

Combinatorial results for semigroups of order-preserving full transformations
Semigroup Forum, Volume 72, No. 1, Year 2006, Citations 45
On certain finite semigroups of order-decreasing transformations I
Semigroup Forum, Volume 69, No. 2, Year 2004, Citations 40
On the Semigroup of Partial Isometries of a Finite Chain
Communications in Algebra, Volume 44, No. 2, Year 2016, Citations 31
On the semigroups of partial one-to-one order-decreasing finite transformations
Proceedings of the Royal Society of Edinburgh: Section A Mathematics, Volume 123, No. 2, Year 1993, Citations 25
Combinatorial results for the symmetric inverse semigroup
Semigroup Forum, Volume 75, No. 1, Year 2007, Citations 18

Institution	Country	Start Year	End Year	Affiliated Years
Khalifa University of Science and Technology	United Arab Emirates	2015	2023	9
Nigerian Defence Academy	Nigeria	2023	2023	1
Bayero University	Nigeria	2023	2023	1
Sultan Qaboos University	Oman	2011	2016	6
King Fahd University of Petroleum and Minerals	Saudi Arabia	2003	2007	5
University of Abuja	Nigeria	1997	1999	3
Ahmadu Bello University	Nigeria	1993	1998	6
University of St Andrews	United Kingdom	1992	1993	2