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math.CO2013★ 1 cited
Lattice Paths and Order-preserving Partial Transformations
A. Laradji, A. Umar
Let be the semigroup of all order-preserving partial transformations of a finite chain. It is shown that there exist bijections between the set of certain lattice pat…
math.CO2013
Constructing Even Order Magic Squares By Consecutive Numbering
A. M. Ibrahim, H. M. Jibril, A. Umar
The aim of this note is to introduce fastest new general methods for the construction of double and single even order magic squares. As in [5], the method for double even order mag…