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Deformation Theory Seminar

Wednesday, December 8, 2010 - 1:00pm

Mikael Vejdemo-Johansson

Stanford

Location

University of Pennsylvania

DRL 4N30

Gröbner bases hold a significant role in introducing computational and computer based techniques to the study of commutative, and later non- commutative, rings. At the core of the Gröbner basis approach is a systematic way to find a new basis for the ring in question that captures not only the additive, but also the multiplicative structure of the ring.

In a recent paper, Dotsenko and Khoroshkin draw up the relevant choices to construct a Gröbner basis theory for symmetric (and non- symmetric by extension) operads over the category of vector spaces. This allows for several interesting new techniques based on these definitions. For starters, being a multiplicative basis, a quadratic Gröbner basis forms a Poincare-Birkhoff-Witt basis, and thus, by a result by Hoffbeck, in itself a proof of Koszularity for the operad in question. Furthermore, having a Gröbner basis means, by standard constructions, that there is a normal form for any expression, which opens up the theory of operads for computational approaches and tools.

In this talk, we will go through the essential definitions and intuitions leading up to the Dotsenko-Khoroshkin paper, and culminate in an overview of a recent computer implementation of the methods of Dotsenko-Khoroshkin, written by Dotsenko and the speaker.