# What Is a Function in Math? Definition, Notation and Examples

> A function assigns exactly one output to each input. Covers the defining rule, the vertical line test, f(x) notation, domain and range, and function vs relation vs equation.

**URL:** https://www.calculatoranswers.com/what-is-a-function-in-math
**Category:** Education

## Disclaimer

This calculator provides estimates for educational and planning purposes. Always consult a qualified professional for specific advice on financial, medical, legal, or other regulated decisions.

---

*This page is part of Calculator Answers — simple calculators, clear answers, no signup required. View all calculators at https://www.calculatoranswers.com/calculators*