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.
The term is derived from the Greek words sialon (saliva) and lithos (stone), and the Latin-iasis meaning process or morbid condition. A calculus (plural calculi) is a hard, stone-like concretion that forms within an organ or duct inside the body.