We first have the basic: If p: YX is a covering, and p(y)= x, then the induced homomorphism p*:π1(Y,y)π1 (X,x) is an injection.
CITATION STYLE
Fulton, W. (1995). The Fundamental Group and Covering Spaces (pp. 179–192). https://doi.org/10.1007/978-1-4612-4180-5_13
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