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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 f ( X ^ n ) \ subseteq Y ^ n 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 .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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