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Inverse Function TheoremIn mathematics, the inverse function theorem gives sufficient conditions for a vector-valued function to be invertible on an open region containing a point in its domain. The theorem states that if at a point P a function f:Rn → Rn has a Jacobian determinant that is nonzero, and f is continuously differentiable near P, it is an invertible function near P. That is, an inverse function exists, in some neighborhood of f(P). The Jacobian matrix of f -1 at f(P) is then the inverse of Jf, evaluated at P.
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