Topic
Morse–Palais lemma.
theorem that a smooth enough function near a critical point can be expressed as a quadratic form after a suitable change of coordinates
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About Morse–Palais lemma
In mathematics, the Morse–Palais lemma is a result in the calculus of variations and theory of Hilbert spaces. Roughly speaking, it states that a smooth enough function near a critical point can be expressed as a quadratic form after a suitable change of coordinates.
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