A value is regular when the derivative is surjective at every point of its preimage.
The preimage of a regular value of a smooth map between manifolds is a smooth submanifold whose codimension equals the dimension of the target.
For a smooth map between smooth manifolds, the set of critical values has measure zero in the target. In particular, regular values are dense.
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- Characteristic line field
- Degree of a power map of the Riemann sphere
- Marsden-Weinstein theorem
- Normal-bundle obstruction to being a regular level set
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- Regular level set
- Seifert hypersurface
- Spherical degree by area pullback
- Symplectic reduction
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