implicit function theorem (Q848375)

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theorem that, under a mild condition on the partial derivatives, the set of zeros of a system of equations is locally the graph of a function
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implicit function theorem
theorem that, under a mild condition on the partial derivatives, the set of zeros of a system of equations is locally the graph of a function

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    the implicit function theorem guarantees that, on the level curve 𝑓(𝑥,𝑦)=1 of the function 𝑓(𝑥,𝑦)=𝑥²+𝑦², near the point 𝐀, 𝑦 can be expressed as a function of 𝑥; no such function, however, exists near the point 𝐁 (English)
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