Unformatted text preview: Â§ 2.1 . This is a reasonable surface, except at the origin, which again is the only place where the gradient grad f vanishes. This might lead us to expect an analogue of Theorem 3.4.2 for functions of three variables. Before stating it, we introduce a useful bit of notation. By 9 Our analysis in Â§ 3.4 clearly carries through if 1 is replaced by any positive number  c ...
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 Fall '08
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 Calculus, Sets, Polar coordinate system, Conic section, Gradient, Level set, level sets

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