Concise Modular Calculus [85/97]: Relative Maxima and Relative Minima of Multivariable Functions

(1/3 on Multivariable Optimization) Explains that, at the location of a relative maximum or minimum, the gradient of a multivariable function must be zero. Justifies the second derivative test as a tool to distinguish whether a critical point is a relative maximum, a relative minimum or a saddle point.

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