Lectures On the Theory of Maxima And Minima of Functions of Several Variables

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, . . . . «n)» and consequently f {^x^, Xi, .... X^ has on the position (ai, a^. , . . . . A„) neither a maximum nor a minimum value.
We therefore have as a second condition for the existence of a maximum or a minimum of the function XC^n -^21 • • • -^n) on the position («!, i?2>- • • -^n) that, in case the second derivatives of the function /"(j^i, ;i:2, . . . . ;i^„) do not all vanish at this position, the homogeneous quadratic form f^\\ dx^dx Iai, a2, an ' must be always negative or always p
...ositive for arbitrary values of ^1, /^2, /?„.
THEORY OF THE HOMOGENEOUS QUADRATIC FORMS.
8. There are two kinds of integral homogeneous functions of the second degree, or, as they are usually called, quadratic forms, viz. : I. , formce indefinita;'* which with real values of the vari- ables can become both positive and negative, and that, too, for values of the variables, whose absolute values do not exceed an arbitrarily small quantity; II. , formce definitce, which with real values of the variables have always the same sign.


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