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Chapter 11: Quadratic Approximations in Several Dimensions

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Introduction

The quadratic approximation in two or more dimensions is examined.We consider the question: when is a critical point a saddle, in two or more directions,

Topics

11.1 Quadratic Behavior in Two or More Dimensions

11.2 Saddle Points

11.3 When is a Critical Point a Maximum, Minimum or Saddle? Criterion