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numbers and algebraic expressions
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trigonometry
plane geometry
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combinatorics
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elements of statistics
kropki game

Function f: X → Y is a relation with property that any element of the set X is related to exactly one element of the set Y. x - arguments (elements in X), y - values (elements in Y). Function is usually denoted by a formula or a graph. Possible notations of a formula of a function: y = x^2, f(x) = x^2.