On the Cayley-Bacharach Property |
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Authors: | Martin Kreuzer Le Ngoc Long Lorenzo Robbiano |
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Institution: | 1. Fakult?t für Informatik und Mathematik, Universit?t Passau, Passau, Germany;2. Dipartimento di Matematica, Università di Genova, Genova, Italy |
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Abstract: | The Cayley-Bacharach Property (CBP), which has been classically stated as a property of a finite set of points in an affine or projective space, is extended to arbitrary 0-dimensional affine algebras over arbitrary base fields. We present characterizations and explicit algorithms for checking the CBP directly, via the canonical module, and in combination with the property of being a locally Gorenstein ring. Moreover, we characterize strict Gorenstein rings by the CBP and the symmetry of their affine Hilbert function, as well as by the strict CBP and the last difference of their affine Hilbert function. |
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Keywords: | Affine Hilbert function canonical module Cayley-Bacharach Property complete intersection Gorenstein ring separator |
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