For the function y = f (x) defined on the set of D.The number M is called the maximum value of the function f (x) on D if f (x) ≤ M ∀ x ∈ D and ∃ x 0 ∈ D such that f (x 0) = M, symbol: maxDy = MThe number m is called the minimum value of the function f (x) on D if f (x) ≥ m ∀ x ∈ D and ∃ x 0 ∈ D such that f (x 0) = m, symbol: minDy = m
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