Differentiable -- from Wolfram MathWorld
https://mathworld.wolfram.com/topics/Calculus.html
Web3 days ago · Differentiable. A real function is said to be differentiable at a point if its derivative exists at that point. The notion of differentiability can also be extended to complex functions (leading to the Cauchy-Riemann equations and the theory of holomorphic functions ), although a few additional subtleties arise …
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