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Cotangent complex and deformations of torsors and group schemes. (English) Zbl 0238.14016

Toposes, algebraic Geometry and Logic, Dalhousie Univ. Halifax 1971, Lect. Notes Math. 274, 159-189 (1972).

MSC:

14L15 Group schemes
13D10 Deformations and infinitesimal methods in commutative ring theory
14F10 Differentials and other special sheaves; D-modules; Bernstein-Sato ideals and polynomials
18G10 Resolutions; derived functors (category-theoretic aspects)
55S99 Operations and obstructions in algebraic topology