If $f$ is defined on the closed interval $[a, b]$, then $f$ has an absolute minimum value in $[a, b]$.If $f$ is continuous on the interval $(a, b)$, then $f$ attains an absolute minimum value at some number $c$ in $(a, b)$.
Added by Austin W.
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It states that if a function is continuous on a closed interval, then it must attain both a maximum and a minimum value on that interval. This is intuitive if you think about drawing a continuous curve on a finite interval - you have to start and stop somewhere, Show more…
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