Theorems in algebraic topology

Cellular approximation theorem

In algebraic topology, the cellular approximation theorem states that a map between CW-complexes can always be taken to be of a specific type. Concretely, if X and Y are CW-complexes, and f : X → Y is a continuous map, then f is said to be cellular, if f takes the n-skeleton of X to the n-skeleton of Y for all n, i.e. if for all n. The content of the cellular approximation theorem is then that any continuous map f : X → Y between CW-complexes X and Y is homotopic to a cellular map, and if f is already cellular on a subcomplex A of X, then we can furthermore choose the homotopy to be stationary on A. From an algebraic topological viewpoint, any map between CW-complexes can thus be taken to be cellular. (Wikipedia).

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CW complex | Homotopy extension property | Map (mathematics) | N-skeleton | Weak equivalence (homotopy theory) | Closure (topology) | Homotopy | Function (mathematics) | Homotopy group | Canonical form | Intersection (set theory) | Mathematical induction | Image (mathematics) | Algebraic topology