First Fundamental Group of 1-Sphere
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Theorem
Let $\mathbb S^1$ be the $1$-sphere.
Let $\struct {\map {\pi _1} {\mathbb S^1}, \ast}$ be the first fundamental group of $\mathbb S^1$.
Let $\struct {\Z, +}$ be the additive group of integers.
Then $\struct {\map {\pi _1} {\mathbb S^1}, \ast}$ is isomorphic to $\struct {\Z, +}$.
Proof
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