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The concept of a function was formalized at the end of the 19th century in terms of set theory, and this greatly increased the possible applications of the concept. A function is often denoted by a letter …

But a function doesn't really have belts or cogs or any moving parts, and it doesn't actually destroy what we put into it! A function relates an input to an output.

Apr 30, 2026 · function, in mathematics, an expression, rule, or law that defines a relationship between one variable (the independent variable) and another variable (the dependent variable).

Apr 27, 2026 · If the power of the variable is 1, it is called a linear function, if the power is 2, it is called a quadratic function, and if the power is 3, it is called a cubic function.

1 day ago · 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.

If every vertical line touches the graph at most once, the graph represents a function. If any vertical line crosses the graph in two or more places, at least one input has multiple outputs, so it is not a function.