AndreQuillen cohomology

General Introduction
This is somehow "cohomology of commutative rings", in some sense "analogous" to the (Hochschild?) cohomology of associative algebras. The should classify extensions in some category of commutative rings.
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Online References
See article in Milles folder.
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Paper References
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Definition
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Properties
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Standard theorems
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Open Problems
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Connections to Number Theory
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Computations and Examples
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History and Applications
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Some Research Articles
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Other Information
Abstract of a talk by Milles: AndrĂ©Quillen cohomology theory of an algebra over an operad. Following the ideas of Quillen and by means of model category structures, Hinich, Goerss and Hopkins have developped a cohomology theory for (simplicial) algebras over a (simplicial) operad. Thank to Koszul duality theory of operads, we describe the cotangent complex to make these theories explicit in the differential graded setting. We recover the known theories as Hochschild cohomology theory for associative algebras and ChevalleyEilenberg cohomology theory for Lie algebras and we define the new case of homotopy algebras. We study the general properties of such cohomology theories and we give an effective criterium to determine whether a cohomology theory is an Extfunctor. We show that it is always the case for homotopy algebras.
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