# degenerate

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**Degeneracy (mathematics)**— For the degeneracy of a graph, see degeneracy (graph theory). This article is about degeneracy in mathematics. For other uses, see Degeneracy. In mathematics, a degenerate case is a limiting case in which a class of object changes its nature so… …102

**White dwarf**— For other uses, see White dwarf (disambiguation). Image of Sirius A and Sirius B taken by the Hubble Space Telescope. Sirius B, which is a white dwarf, can be seen as a faint pinprick of light to the lower left of the much brighter Sirius A …103

**Morse theory**— Morse function redirects here. In another context, a Morse function can also mean an anharmonic oscillator: see Morse potential In differential topology, the techniques of Morse theory give a very direct way of analyzing the topology of a… …104

**Genetic code**— A series of codons in part of a messenger RNA (mRNA) molecule. Each codon consists of three nucleotides, usually representing a single amino acid. The nucleotides are abbreviated with the letters A, U, G and C. This is mRNA, which uses U (uracil) …105

**Perturbation theory (quantum mechanics)**— In quantum mechanics, perturbation theory is a set of approximation schemes directly related to mathematical perturbation for describing a complicated quantum system in terms of a simpler one. The idea is to start with a simple system for which a …106

**Affine focal set**— In mathematics, and especially affine differential geometry, the affine focal set of a smooth submanifold M embedded in a smooth manifold N is the caustic generated by the affine normal lines. It can be realised as the bifurcation set of a… …107

**Degeneracy (graph theory)**— In graph theory, a k degenerate graph is an undirected graph in which every subgraph has a vertex of degree at most k: that is, some vertex in the subgraph touches k or fewer of the subgraph s edges. The degeneracy of a graph is the smallest… …108

**Future of an expanding universe**— Big Freeze redirects here. For other uses, see Big Freeze (disambiguation). Physical cosmology Univ …109

**Коптюг**— Коптюг, Валентин Афанасьевич Валентин Афанасьевич Коптюг Дата рождения: 9 июня 1931(1931 06 09) Место рождения: Юхнов, Западная область, СССР Дата смерти: 10 января 1997 …110

**Star**— For other uses, see Star (disambiguation) …