In calculus, a real-valued function of a real variable or real function is a partial function from the set of the real numbers to itself. Given a real function its multiplicative inverse is also a real function.

Jan 29, 2026 · A function is a relation that uniquely associates members of one set with members of another set. More formally, a function from A to B is an object f such that every a in A is uniquely …

What is the range of a function? Does a vertical line represent a function?

Explore math with our beautiful, free online graphing calculator. Graph functions, plot points, visualize algebraic equations, add sliders, animate graphs, and more.

Thomae's function: is a function that is continuous at all irrational numbers and discontinuous at all rational numbers. It is also a modification of Dirichlet function and sometimes called Riemann function.

In mathematics, a function is a mathematical object that produces an output, when given an input (which could be a number, a vector, or anything that can exist inside a set of things).

function, office, duty, province mean the acts or operations expected of a person or thing. function implies a definite end or purpose or a particular kind of work.