Inversion

Inversion or inversions may refer to:

Arts

 * Inversion (artwork), a 2005 temporary sculpture in Houston, Texas
 * Inversion (music), a term with various meanings in music theory and musical set theory
 * Inversions (novel) by Iain M. Banks
 * Inversion (video game), a 2012 third person shooter for Xbox 360, PlayStation 3, and PC
 * Inversions (EP), the 2014 extended play album by American rock music ensemble The Colourist
 * Inversions (album), a 2019 album by Belinda O'Hooley
 * Inversion (film), a 2016 Iranian film

Linguistics and language

 * Inversion (linguistics), grammatical constructions where two expressions switch their order of appearance
 * Inversion (prosody), the reversal of the order of a foot's elements in poetry
 * Anastrophe, a figure of speech also known as an inversion

Mathematics and logic

 * Additive inverse
 * Involution (mathematics), a function that is its own inverse (when applied twice, the starting value is obtained)
 * Inversion (discrete mathematics), any item that is out of order in a sequence
 * Inverse element
 * Inverse function, a function that undoes the operation of another function.
 * Inversive geometry, a transformation of the Euclidean plane that maps generalized circles to generalized circles
 * Inversion in a point, or point reflection, a kind of isometric (distance-preserving) transformation in a Euclidean space
 * Inversion transformation, a conformal transformation (one which preserves angles of intersection)
 * Method of inversion, the image of a harmonic function in a sphere (or plane); see Method of image charges
 * Multiplicative inverse, the reciprocal of a number (or any other type of element for which a multiplication function is defined)
 * Matrix inversion, an operation on a matrix that results in its multiplicative inverse
 * Model inversion
 * Set inversion

Biology and medicine

 * Inversion (evolutionary biology), a hypothesis about the evolution of the dorsoventral axis in animals
 * Inversion (kinesiology), movement of the sole towards the median plane
 * Chromosomal inversion, where a segment of a chromosome is reversed end-to-end
 * Inversion therapy, the practice of hanging upside down (heart higher than head) for supposed health benefits

Geology

 * Inversion (geology), the relative uplift of a previously basinal area resulting from local shortening, in structural geology
 * Quartz inversion, a change in the crystal structure of quartz at high temperatures
 * Relief inversion, when a previous depression becomes a landform that stands out from its surroundings
 * Seismic inversion, transforming seismic reflection data into a quantitative rock-property description of a geological formation

Physics and chemistry

 * Island of inversion, a group of elements with abnormal nuclear shell structure
 * Nitrogen inversion, a chemical process in which a trigonal nitrogen-containing structure turns inside-out
 * Population inversion, in statistical mechanics, when a system exists in state with more members in an excited state than in lower-energy states
 * Pyramidal inversion, a chemical process in which a trigonal structure turns inside-out
 * Inverted sugar syrup, a chemical reaction converting sucrose into glucose and fructose

Other uses in the natural sciences

 * Inverse problem, the process of calculating from a set of observations the causal factors that produced them
 * Inversion (meteorology), air temperature increasing with height

Other uses

 * Priority inversion, the condition of a low-priority task holding a shared resource that a high-priority task needs
 * Inversion in postcolonial theory, a discursive strategy/gesture in cultural and subaltern studies
 * Roller coaster inversion, which turns riders upside-down
 * Tax inversion, a form of tax avoidance by moving corporate ownership to low-tax nations