Question: A differentiable function f (x, y) has a saddle point at a point (a, b) where its partial derivatives are simultaneously zero, if in every

A differentiable function f (x, y) has a saddle point at a point (a, b) where its partial derivatives are simultaneously zero, if in every open disk centered at (a,b) there are domain points where f (x, y) > f (a, b) and domain points where f (x, y)

f(x, y) = x-y-2xy +6

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