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math.GR2015
Algebraic properties of G-groupoids
Mihai Ivan
The main purpose of this paper is to give a new definition for the notion of group-groupoid. Also, several basic properties of group-groupoids are established.
math.GR2010
A Package of Programs for Determination of Some Classes of Subgroupoids
Gheorghe Ivan, Mihai Ivan
We give three programs on computer for finding the subgroupoids, wide subgroupoids and normal subgroupoids of a finite groupoid.