Kelly's story is truly inspirational. Kelly has shown that pure determination, dedication and hard work can and does change a person's life. At Life Leisure we have loved being part of Kelly's journey.
In calculus (a branch of mathematics), a differentiable function of one real variable is a function whose derivative exists at each point in its domain.
1 Smooth function, a function that is infinitely differentiable; used in calculus and topology. 2  Smooth manifold, a differentiable manifold for which all the transitions maps are smooth functions.  Smooth algebraic variety, an algebraic variety without singular point.