I have used this method quite a lot but I have never completely understood the proof. The only book I have that provides a proof is Shifrin's "Multivariable Mathematics" which I find kind of confusing. Stewart's "proof" is more or less just geometric intuition. Does anyone know of a book that provides a rigorous proof of this result or a website that does?(adsbygoogle = window.adsbygoogle || []).push({});

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# Proof of the method of lagrange multipliers

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