Proposition 1.33 (lifting criterion): $f$ lifts iff $f_*\pi_1(Y,y_0)\subseteq p_*\pi_1(\tilde X,\tilde x_0)$

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Proposition 1.33 (lifting criterion): $f$ lifts iff $f_*\pi_1(Y,y_0)\subseteq p_*\pi_1(\tilde X,\tilde x_0)$ · Prove2Me