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Minimal projective resolutions
Authors:E L Green  Ø  Solberg  D Zacharia
Institution:Department of Mathematics, Virginia Tech, Blacksburg, Virginia 24061-0123 ; Institutt for matematiske fag, NTNU, Lade, N--7491 Trondheim, Norway ; Department of Mathematics, Syracuse University, Syracuse, New York 13244
Abstract:

In this paper, we present an algorithmic method for computing a projective resolution of a module over an algebra over a field. If the algebra is finite dimensional, and the module is finitely generated, we have a computational way of obtaining a minimal projective resolution, maps included. This resolution turns out to be a graded resolution if our algebra and module are graded. We apply this resolution to the study of the $\operatorname{Ext}$-algebra of the algebra; namely, we present a new method for computing Yoneda products using the constructions of the resolutions. We also use our resolution to prove a case of the ``no loop' conjecture.

Keywords:Projective resolutions  finite dimensional and graded algebras
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