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Theorem 19.3:

We the group isomorphism

Deck$\displaystyle (\widetilde X, X) \cong N(p{*}(\pi_1(\widetilde X, \tilde x_1))/p{*}(\pi_1(\widetilde X, \tilde x_1)). \eqno(19.4) $


nisha 2012-03-20