Degeneracy, degenerate, or degeneration may refer to:

Arts and entertainment

* ''Degenerate'' (album), a 2010 album by the British band Trigger the Bloodshed * Degenerate art, a term adopted in the 1920s by the Nazi Party in Germany to describe modern art ** Decadent movement, often associated with degeneracy *

Dégénération "Dégénération" (English: "Degeneration") is a 2008 song by French singer-songwriter Mylène Farmer. It was the first single from her seventh studio album '' Point de Suture'', and was released first digitally and on radio in June 2008, then in ...

, a single by Mylène Farmer * ''Degeneration'' (Nordau), an 1892 book by Max Nordau * '' Resident Evil: Degeneration'', a 2008 film * "Degenerate", a song by Blink-182 from the album ''

Dude Ranch A guest ranch, also known as a dude ranch, is a type of ranch oriented towards visitors or tourism. It is considered a form of agritourism. History Guest ranches arose in response to the romanticization of the American West that began to occur ...

'' * "Degenerates", a song by A Day to Remember from the album '' You're Welcome''

Science, mathematics, and medicine

Mathematics

* Degeneracy (mathematics), a limiting case in which a class of object changes its nature so as to belong to another, usually simpler, class * Degeneracy (graph theory), a measure of the sparseness of a graph *

Degeneration (algebraic geometry) In algebraic geometry, a degeneration (or specialization) is the act of taking a limit of a family of varieties. Precisely, given a morphism :\pi: \mathcal \to C, of a variety (or a scheme) to a curve ''C'' with origin 0 (e.g., affine or projective ...

, the act of taking a limit of a family of varieties * Degenerate form, bilinear form ''f''(''x'', ''y'') on a vector space ''V'' is one such that the map from ''V'' to ''V*'' (the dual space of ''V'') given by is not an isomorphism *

Degenerate distribution In mathematics, a degenerate distribution is, according to some, a probability distribution in a space with support only on a manifold of lower dimension, and according to others a distribution with support only at a single point. By the latter d ...

, the probability distribution of a random variable which only takes a single value * Degenerate conic, a conic (a second-degree plane curve, the points of which satisfy an equation that is quadratic in one or the other or both variables) that fails to be an irreducible curve *

Degenerate dimension According to Ralph Kimball, in a data warehouse, a degenerate dimension is a dimension key in the fact table that does not have its own dimension table, because all the interesting attributes have been placed in analytic dimensions. The term "de ...

, a dimension key in the fact table that does not have its own dimension table, because all the interesting attributes have been placed in analytic dimensions. The term "degenerate dimension" was originated by Ralph Kimball

Quantum mechanics

* Degenerate energy levels, different arrangements of a physical system which have the same energy *

Degenerate matter Degenerate matter is a highly dense state of fermionic matter in which the Pauli exclusion principle exerts significant pressure in addition to, or in lieu of, thermal pressure. The description applies to matter composed of electrons, protons, n ...

, a very highly compressed phase of matter which resists further compression because of quantum mechanical effects *

Degenerate semiconductor A degenerate semiconductor is a semiconductor with such a high level of doping that the material starts to act more like a metal than as a semiconductor. Unlike non-degenerate semiconductors, these kind of semiconductor do not obey law of mass ac ...

, a semiconductor with such a high doping-level that the material starts to act more like a metal than as a semiconductor

Other uses in science and medicine

Degeneracy (biology) Within biological systems, degeneracy occurs when structurally dissimilar components/modules/pathways can perform similar functions (i.e. are effectively interchangeable) under certain conditions, but perform distinct functions in other conditions. ...

, the ability of elements that are structurally different to perform the same function or yield the same output **

Codon degeneracy Degeneracy or redundancy of codons is the redundancy of the genetic code, exhibited as the multiplicity of three-base pair codon combinations that specify an amino acid. The degeneracy of the genetic code is what accounts for the existence of synon ...

, in genetics *

Degeneration (medicine) Degeneration is deterioration in the medical sense. Generally, it is the change from a higher to a lower form. More specifically, it is the change of tissue to a lower or less functionally active form. *True degeneration: when there is actual ...

Degenerative disease Degenerative disease is the result of a continuous process based on degenerative cell changes, affecting tissues or organs, which will increasingly deteriorate over time. In neurodegenerative diseases, cells of the central nervous system stop wor ...

, a disease that causes deterioration over time * Social degeneration, a late 19th–early 20th century sociological concept

Other uses

* Degeneration, a type of