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.
Mathematics. ( 1 of a function of a complex variable) having a first derivative at all points of a given domain; holomorphic; regular. ( 2 of a curve) having parametric equations that represent analytic functions. ( 3 of a proof) using analysis.