Document Type

Article

Publication Date

12-2013

Publication Title

Journal of Homotopy and Related Structures

Volume

10

Issue

3

Pages

437-458

Publisher Name

Springer

Abstract

The deformations of an infinite dimensional algebra may be controlled not just by its own cohomology but by that of an associated diagram of algebras, since an infinite dimensional algebra may be absolutely rigid in the classical deformation theory for single algebras while depending essentially on some parameters. Two examples studied here, the function field of a sphere with four marked points and the first Weyl algebra, show, however, that the existence of these parameters may be made evident by the cohomology of a diagram (presheaf) of algebras constructed from the original. The Cohomology Comparison Theorem asserts, on the other hand, that the cohomology and deformation theory of a diagram of algebras is always the same as that of a single, but generally rather large, algebra constructed from the diagram.

Comments

Author Posting. © Tbilisi Centre for Mathematical Sciences, 2013. This article is posted here by permission of the Tbilisi Centre for Mathematical Sciences for personal use, not for redistribution. The article was published in the Journal of Homotopy and Related Structures, December 2011. http://dx.doi.org/10.1007/s40062-013-0068-x

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