Differentiable Function Differentiability of a function at a point The function, f(x) is differentiable at point P, iff there exists a unique tangent at point P. In other words, f(x) is differentiable at a point P iff the curve does not have P as a corner point. i.e., "the function is not differentiable at those points on which function has jumps (or holes) and sharp … [Read more...] about Differentiable Function