Homeomorphic topological spaces have isomorphic fundamental groups/Statement
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< Homeomorphic topological spaces have isomorphic fundamental groups
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Statement
Let (X,J) and (Y,K) be homeomorphic topological spaces, let p∈X be given (this will be the base point of the fundamental group π1(X,p)) and let φ:X→Y be that homeomorphism. Then: [1]:
- π1(X,p)≅π1(Y,φ(p)) - where ≅ denotes group isomorphism here, but can also be used to denote topological isomorphism (AKA: homeomorphism)
That is to say:
- (X≅φY)⟹(π1(X,p)≅φ∗π1(Y,φ(p)))
References