Abdullahi Umar

According to our database, Abdullahi Umar authored at least 6 papers between 1998 and 2025.

Collaborative distances:

• Dijkstra number of six.
• Erdős number of six.

2025

Geostatistical and multivariate analysis of phosphate evolution and its relationship with heavy metals in shallow groundwater in a Semi-Arid Basin.

Saadu Umar Wali, Noraliani Binti Alias, Abdulqadir Abubakar Usman, Abdullahi Umar, Nasiru Muhammad, Ismail Usman Kaoje, Buhari Samaila, Basiru Aliyu, Habiba Muhammad Ladan, Mudassiru Atiku, Sa'ad Ibrahim

Earth Sci. Informatics, March, 2025

2024

Combinatorial results for order-preserving partial injective contraction mappings.

Ahmed Bayo Musa, Nadia Aldhamri, Fatma Al-Kharousi, Georg Klein, Abdullahi Umar

Contributions Discret. Math., 2024

2014

Combinatorial results for certain semigroups of partial isometries of a finite chain.

Fatma Al-Kharousi, R. Kehinde, Abdullahi Umar

Australas. J Comb., 2014

2013

On The Number Of Subpermutations With Fixed Orbit Size.

Abdallah Laradji, Abdullahi Umar

Ars Comb., 2013

2011

Some Combinatorial Properties of the Symmetric Monoid.

Abdullahi Laradji, Abdullahi Umar

Int. J. Algebra Comput., 2011

1998

Enumeration of certain finite semigroups of transformations.

Abdullahi Umar

Discret. Math., 1998