Algebraic Topology · Problem 4H.4

Homotopy Theory — Allen Hatcher

Mathematics — Topology · eckmann-hilton-duality

Problem

Define the dual of an iterated mapping cylinder precisely, in terms of maps from Δn\Delta^n, and use this to give a definition of ∇X\nabla X, the dual of ΔX\Delta X, for XX a complex of spaces.

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