$f(x,y)=x^2-y^2$ is your friendly neighbourhood hyperbolic paraboloid. $f(x, y) = |x| - |y|$ naturally has similar appearance. Do shapes of the latter form have a name?
2026-04-11 20:11:49.1775938309
What is $f(x, y) = |x| - |y|$ called?
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