Prove that if is continuous and (a, b) < 0, then there exists a -neighborhood about

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Prove that if ƒ is continuous and ƒ(a, b) < 0, then there exists a δ-neighborhood about (a, b) such that ƒ(x, y) < 0
for every point (x, y) in the neighborhood.

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Calculus

ISBN: 9781285057095

10th Edition

Authors: Ron Larson, Bruce H. Edwards

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