On realizing diagrams of Pi-algebras

Details On realizing diagrams of Pi-algebras On realizing diagrams of Pi-algebras

2006-04-07

arxiv.org/abs/math/0604161v2

Algebr. Geom. Topol. 6 (2006) 763-807

Mathematics

Algebraic Topology

This is the version published by Algebraic & Geometric Topology on 21 June 2006

Scientific paper

10.2140/agt.2006.6.763

Given a diagram of Pi-algebras (graded groups equipped with an action of the primary homotopy operations), we ask whether it can be realized as the homotopy groups of a diagram of spaces. The answer given here is in the form of an obstruction theory, of somewhat wider application, formulated in terms of generalized Pi-algebras. This extends a program begun in [J. Pure Appl. Alg. 103 (1995) 167-188] and [Topology 43 (2004) 857-892] to study the realization of a single Pi-algebra. In particular, we explicitly analyze the simple case of a single map, and provide a detailed example, illustrating the connections to higher homotopy operations.

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