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.
infinitesimal calculus, calculus-the branch of mathematics that is concerned with limits and with the differentiation and integration of functions. set theory-the branch of pure mathematics that deals with the nature and relations of sets. group theory-the branch of mathematics dealing with groups.