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A generalization of group difference sets and the matrix equationA m =dI+λJ
Let G be a finite group. In this paper, we will study the α -group matrices for G which satisfy the matrix A m = dI +λJ and we will show that the existence...
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An equational approach to products of relatively regular operators
A bounded linear operator T on Banach space X is called relatively regular if its nullspace N(T) and range R(T) are closed complemented subspaces of X. It...