this post was submitted on 11 Sep 2023
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[โ€“] Shard@lemmy.world 11 points 1 year ago (1 children)

Technical definition is a 3-Torus sandwich, defined as any sandwich that is homeomorphic to the Cartesian product of three circles.

[โ€“] been_jamming@lemm.ee 1 points 1 year ago* (last edited 1 year ago)

Isn't it S_1 x S_1 x [0, 1] here though?