Hatcher §1.2: the homomorphisms $j_\alpha$, $\Phi$, $i_{\alpha\beta}$ and the normal subgroup $N$ of van Kampen's theorem

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Hatcher §1.2: the homomorphisms $j_\alpha$, $\Phi$, $i_{\alpha\beta}$ and the normal subgroup $N$ of van Kampen's theorem · Prove2Me