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Espaces formels et $$\pi$$ -formels. (French) Zbl 0546.55013
Homotopie algébrique et algèbre locale, Journ. Luminy/France 1982, Astérisque 113-114, 96-108 (1984).
Summary: [For the entire collection see Zbl 0535.00017.]
Summary and synthesis of the theory of formal and $$\pi$$ -formal spaces: Definition and properties, obstructions to formality and study of spaces with Poincaré duality are the three main aspects of this lecture.

##### MSC:
 55P62 Rational homotopy theory 55M05 Duality in algebraic topology 57P10 Poincaré duality spaces 17B70 Graded Lie (super)algebras 13N05 Modules of differentials 16W50 Graded rings and modules (associative rings and algebras)