Linear and Multilinear Algebra · 1990 · 41 citations · 2 references
Natural SciencesPathologyAlgebraLinear AlgebraMatrix ComputationMatrix StructureIdempotenceIdempotent Decomposition
It is shown that a matrix A, ovei a field of characteristic zero, is a sum of idempotents. exactly when the trace of A is an integer at least as large as rank(A).
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On products of idempotent matrices
J. A. Erdös · Glasgow Mathematical Journal · 1967 · 154 citations · Full text