• affiliate@lemmy.world
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      6 months ago

      under an appropriate level of abstraction you can make lots of types of cylinders. in topology you can define a cylinder of a (topological space) X to just be X × [0,1]. this kind of definition comes up pretty frequently, and is used to create mapping cylinders, which i suppose are another type of cylinder.

      the “normal” kind of cylinder is then just (circle) × [0,1], or (filled in circle) × [0,1], depending on whether you want it to look like an empty paper towel roll or a (full) can of beans

    • gibmiser@lemmy.world
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      6 months ago

      Well if you made a penguin into an approximate cylinder it would likely be oval shaped soo since we are talking approximations I would say yes, there are cylinder like shapes that are not circular