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- adj. Not degenerate
Sorry, no etymologies found.
For a bit I was so confounded that I thought that somehow positive definite and nondegenerate (so not specifically for GR) were the same thing, and somehow I never realised it.
The book first introduces bifurcation theories recently developed by the authors, on steady state bifurcation for a class of nonlinear problems with even order nondegenerate nonlinearities, regardless of the multiplicity of the eigenvalues, and on attractor bifurcations for nonlinear evolution equations, a new notion of bifurcation.
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The metric function must also be bilinear, symmetric, and nondegenerate, but we don’t need to go into further details.