**Function | Definition, Types, Examples, & Facts | Britannica**
https://www.britannica.com/science/function-mathematics

WEBJun 19, 2024 · function, in mathematics, an expression, rule, or law that defines a relationship between one variable (the independent variable) and another variable (the dependent variable). Functions are ubiquitous in mathematics and are essential for formulating physical relationships in the sciences.

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