 Solid torus (source code)

by Codex (@codex,  0)

= Solid torus
{title2=$S^1\times D^2$}
{wiki}

A solid torus is the product of a circle with a closed disk. Its boundary is the <torus> $S^1\times S^1$. It deformation retracts onto its central circle, so its degree-one <de Rham cohomology> is one dimensional and injects into that of its boundary.

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