# GDO

## Seminar

### The rational homotopy theory of spaces (mini-course)

Seminar Room 2, Newton Institute Gatehouse

#### Abstract

The rational homotopy theory of spaces is the study of topological spaces modulo torsion. The rational homotopy of a space is determined by two dual algebraic models: the Sullivan model, defined by a commutative dg-algebra structure, and the Quillen model, defined by a Lie dg-algebra.Furthermore, each space has a minimal Sullivan model, which can be used to prove that the rational homotopy automorphisms of a space form an algebraic group, with a deformation complex of the Sullivan model as Lie algebra. The purpose of this lecture is to provide a survey of these results, after short recollections on the definition of the Sullivan model of a space.

General reference: B. Fresse, "Homotopy of operads and Grothendieck-Teichmüller Groups". Book project. First volume available on the web-page "http://math.univ-lille1.fr/%7Efresse/OperadGT-December2012Preprint.pdf"

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