# Coherence > Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Coherence > Markdown URL: https://mediated.wiki/source/Coherence.md > Source: https://en.wikipedia.org/wiki/Coherence > Source revision: 1343115872 > License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) {{Broad-concept article}}{{wiktionary|coherence|coherency|coherent|incoherence|incoherent}} Coherence is, in general, a state or situation in which all the parts or ideas fit together well so that they form a united whole. More specifically, '''coherence''', '''coherency''', or '''coherent''' may refer to the following: {{TOC right}} == Physics == * [Coherence (physics)](/source/Coherence_(physics)), an ideal property of waves that enables stationary (i.e. temporally and spatially constant) interference * [Coherence (units of measurement)](/source/Coherence_(units_of_measurement)), a derived unit that, for a given system of quantities and for a chosen set of base units, is a product of powers of base units with no other proportionality factor than one * [Coherence time](/source/Coherence_time), the time over which a propagating wave (especially a laser or maser beam) may be considered coherent; the time interval within which its phase is, on average, predictable == Mathematics == * [Coherence (philosophical gambling strategy)](/source/Coherence_(philosophical_gambling_strategy)), a concept in Bayesian statistics * [Coherence (signal processing)](/source/Coherence_(signal_processing)), a statistic that can be used to examine the relation between two signals or data sets * [Coherence (statistics)](/source/Coherence_(statistics)), a property of self-consistency across a set of assessments, or the strength of association between two series * [Coherence condition](/source/Coherence_condition) in category theory, a collection of conditions requiring that various compositions of elementary morphisms are equal * [Coherency (homotopy theory)](/source/Coherency_(homotopy_theory)) in homotopy theory and (higher) category theory * [Coherent sampling](/source/Coherent_sampling), a relationship used in Fast Fourier transforms * [Coherent set of characters](/source/Coherent_set_of_characters) in representation theory, a property of sets of characters that allows one to extend an isometry from the degree-zero subspace of a space of characters to the whole space * [Coherent sheaf](/source/Coherent_sheaf), a specific class of sheaves having particularly manageable properties closely linked to the geometrical properties of the underlying space * [Mutual coherence (linear algebra)](/source/Mutual_coherence_(linear_algebra)), sometimes referred to as coherence, the maximum absolute value of the cross-correlations between the columns of a matrix * [Multi-spectral phase coherence](/source/Multi-spectral_phase_coherence), a generalized nonlinear cross-frequency phase coupling metric introduced by Yang et al., 2016 * [Coherence (fairness)](/source/Coherence_(fairness)), a consistency requirement of fair division rules. * [Coherent topology](/source/Coherent_topology), topology determined by a family of subspaces. == Philosophy == * [Coherentism](/source/Coherentism), philosophical theories in modern epistemology, the study of knowledge * [Coherence theory of truth](/source/Coherence_theory_of_truth), a theory which regards truth as coherence within some specified set of sentences, propositions or beliefs == Computer science == * [Coherence (programming language)](/source/Coherence_(programming_language)), an experimental programming language based upon Subtext * [Cache coherence](/source/Cache_coherence), a special case of memory coherence * [Memory coherence](/source/Memory_coherence), a concept in computer architecture * In scrum and agile methodologies, [coherence](/source/Product_backlog) is defined as a measure of the relationships between backlog items which make them worthy of consideration as a whole. === IT products === * [Coherence (software)](/source/Coherence_(software)), a component of Parallels Desktop for Mac, the Windows virtualization software * [Coherent (operating system)](/source/Coherent_(operating_system)), a UNIX-clone operating system * [Oracle Coherence](/source/Oracle_Coherence), an in-memory data grid product from Oracle == Other uses == * [Coherence (cognitive science)](/source/Coherence_(cognitive_science)), a property of mental/cognitive states * [Coherence (linguistics)](/source/Coherence_(linguistics)), what makes a text semantically meaningful * [Coherence (music theory)](/source/Coherence_(music_theory)), a synonym for strict Rothenberg propriety in diatonic set theory * [Coherent optical module](/source/Coherent_optical_module), a hot-pluggable optical transceiver implementing a coherent modulation algorithm * [Coherence time (communications systems)](/source/Coherence_time_(communications_systems)), duration when a communication channel can be assumed to be constant * [Coherent, Inc.](/source/Coherent%2C_Inc.), a company specializing in equipment to make and measure coherent light (lasers) * [Coherent risk measure](/source/Coherent_risk_measure) in financial economics, a function that satisfies properties of monotonicity, sub-additivity, homogeneity, and translational invariance * [''Coherence'' (film)](/source/Coherence_(film)), a 2013 science fiction film by James Ward Byrkit * Sense of coherence, a construct in the health theory [salutogenesis](/source/Salutogenesis) * [Policy coherence for development](/source/Policy_coherence_for_development), a concept in development cooperation == See also == * [Cohesion (disambiguation)](/source/Cohesion_(disambiguation)) * [Mutual coherence (disambiguation)](/source/Mutual_coherence_(disambiguation)) * {{Lookfrom|coherence}} * {{Lookfrom|coherent}} {{disambiguation}} --- Adapted from the Wikipedia article [Coherence](https://en.wikipedia.org/wiki/Coherence) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Coherence?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.