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Tree-indexed series, theory and examples I

Presented by: 
F Chapoton Université Claude Bernard Lyon 1
Date: 
Thursday 31st January 2013 - 14:00 to 15:00
Venue: 
INI Seminar Room 1
Abstract: 
To any operad, one can associate a pro-unipotent group much alike the group of formal power series in one variable. This provides a theoretical framework for the use of tree-indexed series in numerical analysis (under the name of Butcher series) by using the PreLie operad. Some examples of tree-indexed series will be presented, with relations to polytopes and Lie idempotents.
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