Our anti-de Sitter club is small at the moment, but I’ve started corresponding with the conformal field theory people.

https://explainxkcd.com/3077/

  • knightly the Sneptaur
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    16 days ago

    Yup! That saddle is a shape of constant negative curvature. On a toroid, the inside of the hole would have negative curvature and the outside would have positive curvature.