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math.RA2004
Universal localization of triangular matrix rings
Desmond Sheiham
If R is a triangular 2x2 matrix ring, the columns, P and Q, are projective left R-modules. We describe the universal localization of R which makes invertible an R-module morphism P…
math.RA2001
Non-commutative Characteristic Polynomials and Cohn Localization
Desmond Sheiham
Almkvist proved that for a commutative ring A the characteristic polynomial of an endomorphism α:P \to P of a finitely generated projective A-module determines (P,α) up to extensio…