Editing Differentiable function (section)

==Differentiable functions on manifolds==
{{See also|Differentiable manifold#Differentiable functions}}
If ''M'' is a [[differentiable manifold]], a real or complex-valued function ''f'' on ''M'' is said to be differentiable at a point ''p'' if it is differentiable with respect to some (or any) coordinate chart defined around ''p''. If ''M'' and ''N'' are differentiable manifolds, a function ''f'':&nbsp;''M''&nbsp;→&nbsp;''N'' is said to be differentiable at a point ''p'' if it is differentiable with respect to some (or any) coordinate charts defined around ''p'' and ''f''(''p'').