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Problems in Mathematical Analysis.pdf - pwp.net.ipl.pt

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Sec. 1] The Extrema of a Function of One Argument 85<br />

The sufficient conditions for the existence and absence of an extremum of a<br />

cont<strong>in</strong>uous function / (x) are given by the follow<strong>in</strong>g rules:<br />

1. If there exists a neighbourhood (XQ 6, * + 6) of a critical po<strong>in</strong>t *<br />

such that /'(x)>0 for X Q d

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