Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License
 adj. Not singular.
Etymologies
from Wiktionary, Creative Commons Attribution/ShareAlike License
Examples

To put it another way, a spacetime is nonsingular when it is complete in the sense that the only reason any given path might not be extendible is that it's already infinitely long

This would include: the formation and decay of (nonsupersymmetric) black holes; graviton scattering at hyperPlanckian energies; physically continuous transitions from one topology, through a quantum state with no geometric interpretation, to a different topology; states where a submanifold of spacetime has a noncommutative geometry; states with a variety of apparent geometric singularities, where the physics is nonsingular.

Similarly a group can be defined as any homologue of the group of rotations of the sphere, or of the nonsingular

The term "nonsingular matrix" is one whose [[kernel]] is 0

They also explore the eigenvalues, eigenvectors, and characteristic polynomial of a matrix; examine the important properties of nonnegative matrices that are part of the Perron – Frobenius theory; and study eigenvalue inclusion regions and signnonsingular matrices.
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