View source for Regular value

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[[Category:Analysis]]

''of a differentiable function $f: \mathbb R^m \to \mathbb R^n$ with $n\leq m$''. A value $c\in \mathbb R^n$ such that the
differential of $f$ is surjective at every preimage of $c$. The concept can be readily extended to the case when the domain
and the target are smooth manifolds and to various infinite-dimensional settings.