Maybe a stupid question, but my googling is weak. I know the mathematical notation for a torus in 3-D is $\mathbb{T}^2$, but strictly speaking a torus is hollow, so is there a short notation for the solid torus? $S^1 \times D^2 = ?$
Thanks!
2026-04-03 08:08:14.1775203694
Mathematical notation for solid torus?
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