PROOF 125
Prove.
The maximum and minimum come from the vertex
On the real numbers ℝ.
Definition D1
If f(p) ≤ f(x) for every x, then f(p) is called the minimum of f and p a minimum point. If f(x) ≤ f(p) for every x, then f(p) is called the maximum and p a maximum point.
Proof.
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