The fibred product near-rings and near-ring modules for certain categories
The fibred product near-rings and near-ring modules for certain categories
In somes categories, there are structures that look very much like groups, and they usually are. These structures are called group-objects and were first studied by Eckmann and Hilton (1). If our category has an object T such that hom( X, T )= { t x }, a singleton, for …