TheoremBase

Extreme Value Theorem on a Compact Interval

Statement

Let a,b∈Ra,b\in \mathbb{R} with a<ba<b, and let f:[a,b]→Rf:[a,b]\to\mathbb{R} be continuous at every point in [a,b][a,b]. Then there exist points xmin⁡,xmax⁡∈[a,b]x_{\min},x_{\max}\in[a,b] such that

f(xmin⁡)≤f(x)≤f(xmax⁡)for all x∈[a,b].f(x_{\min})\le f(x)\le f(x_{\max})\quad\text{for all }x\in[a,b].

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