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Le 07/09/2020 à 19:28, Bald Eagle a écrit :
> Thomas de Groot <tho### [at] degroot org> wrote:
>
>> My first thought: pulley.
>
> My third thought was that it would be what was left when one subtracted away a
> torus.
> So, a donut hole, or an anti-torus.
> Maybe something akin to a "munchkin". :D
>
> There apparently _IS_ an antitorus, but I can't find a clear description or
> illustration of what exactly it is.
I knew there was an antisphere, an "object" with a constant negative
curvature. (found in pseudosphere in wolfram)
https://mathworld.wolfram.com/Pseudosphere.html
And Thomas is right, the hole of a torus is involved.
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