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  • ...ath> as a (covariant) [[functor]] from the [[category of based topological spaces]] to the [[category of groups]]. ...ecifically, if <math>X</math> and <math>Y</math> are [[homeomorphic spaces|homeomorphic]] then <math>\pi_1(X)</math> and <math>\pi_1(Y)</math> are isomorphic.
    8 KB (1,518 words) - 19:11, 23 January 2017