I'm just curious, so is there a word that you could use to express that a mathematical function has a derivative?
1 Answer
Introduction to Differential Calculus: Systematic Studies ... Ulrich L. Rohde, G. C. Jain, Ajay K. Poddar - 2012
If a function has a derivative at x1 of its domain, then it is said to be differentiable at x1 ... Differentiable Function: If a function is differentiable at every number in its domain, it is called a differentiable function.