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The zero-level centralizer in endomorphism algebras
For an endomorphism φ ∈ End R ( M ) of a left R -module R M , we investigate the structure and the polynomial identities of the zero-level centralizer Cen 0 (φ) and the factor Cen(φ)/Cen 0 (φ). A double zero-centralizer theorem for Cen 0 (Cen 0 (φ)) is …