Every idea

Ideas 14701–14850 of 19838.

Name	Kind	Subject
Particular values of the gamma function	Example	Special functions
Qubit	Definition	Quantum theory
Hedetniemi's conjecture	Counterexample	Combinatorics
Projection body	Definition	Convex and discrete geometry
Absolute summability	Definition	Sequences, series, summability
Chebyshev iteration	Theorem	Numerical analysis
Detectability	Concept	Systems theory; control
Moving-average model	Concept	Statistics
Dürer's conjecture	Conjecture	Convex and discrete geometry
Noether's second theorem	Theorem	Mechanics of particles and systems
Geopotential model in spherical harmonics	Definition	Geophysics
Semidefinite programming	Definition	Operations research, mathematical programming
Torsion-free group	Concept	Group theory and generalizations
Blandford–Znajek process	Definition	Relativity and gravitational theory
Incentive compatibility	Definition	Game theory, economics, finance, and other social and behavioral sciences
Levi pseudoconvex domain	Concept	Several complex variables and analytic spaces
Axiom of determinacy	Concept	Mathematical logic and foundations
Input–output model	Concept	Game theory, economics, finance, and other social and behavioral sciences
Wave front set	Definition	Partial differential equations
Connes–Thom isomorphism	Theorem	Functional analysis
Complete statistic	Definition	Statistics
Lattice polytope	Definition	Convex and discrete geometry
Catmull–Clark subdivision surface	Theorem	Numerical analysis
Dbar operator	Definition	Several complex variables and analytic spaces
Statistical mechanics	Definition	Statistical mechanics, structure of matter
Content	Concept	Measure and integration
Rate–distortion theory	Concept	Information and communication theory, circuits
Horvitz–Thompson estimator	Definition	Statistics
Caloric function	Concept	Partial differential equations
Savitch's theorem	Theorem	Computer science
Algebra of sets	Concept	Measure and integration
Contraction semigroup	Definition	Operator theory
Modular function	Definition	Topological groups, Lie groups
Topological Hochschild homology	Concept	K-theory
Edmonds–Karp algorithm	Concept	Operations research, mathematical programming
Bruhat decomposition of a Lie group	Theorem	Topological groups, Lie groups
Antipode	Concept	Associative rings and algebras
Homotopy group	Definition	Algebraic topology
Amenable group	Definition	Abstract harmonic analysis
Kneser's theorem on solution sets	Theorem	Ordinary differential equations
Cardinal points of an optical system	Definition	Optics, electromagnetic theory
Solar dynamo	Definition	Astronomy and astrophysics
Quasicircle	Definition	Functions of a complex variable
Two-body problem in general relativity	Problem	Relativity and gravitational theory
Mahlo cardinal	Definition	Mathematical logic and foundations
Absolute Galois group	Concept	Field theory and polynomials
Nörlund–Rice integral	Theorem	Difference and functional equations
Gauss's spherical harmonic analysis of the geomagnetic field	Theorem	Geophysics
MacCormack method	Concept	Numerical analysis
Universal Horn class	Definition	Mathematical logic and foundations
Christodoulou–Klainerman stability of Minkowski space	Theorem	Relativity and gravitational theory
Inverse Z-transform	Theorem	Integral transforms, operational calculus
Motzkin number	Definition	Combinatorics
K-homology	Definition	K-theory
Hopfian group	Concept	Group theory and generalizations
Solow–Swan model	Definition	Game theory, economics, finance, and other social and behavioral sciences
Regular conditional probability	Concept	Probability theory and stochastic processes
Bergman projection	Definition	Several complex variables and analytic spaces
Ax–Kochen theorem	Theorem	Field theory and polynomials
Measurable function	Definition	Measure and integration
Electrical network	Definition	Potential theory
Molodensky's problem	Problem	Geophysics
Plancherel theorem for spherical functions	Theorem	Abstract harmonic analysis
Parametric transversality theorem	Theorem	Manifolds and cell complexes
Hydrodynamic stability	Definition	Fluid mechanics
Absorbing element	Concept	General algebraic systems
Polarization of light	Concept	Optics, electromagnetic theory
Lifting idempotents	Definition	Associative rings and algebras
Bose–Einstein statistics	Definition	Statistical mechanics, structure of matter
M. Riesz theorem on the Hilbert transform	Theorem	Harmonic analysis on Euclidean spaces
Fractional Fourier transform	Definition	Harmonic analysis on Euclidean spaces
Gompertz–Makeham law of mortality	Definition	Game theory, economics, finance, and other social and behavioral sciences
Short-time Fourier transform	Definition	Harmonic analysis on Euclidean spaces
Prigogine's minimum entropy production principle	Theorem	Statistical mechanics, structure of matter
Degeneracy and cycling in the simplex method	Concept	Operations research, mathematical programming
Lie derivative	Concept	Differential geometry
Discrete spectrum	Concept	Operator theory
Branch and bound	Definition	Operations research, mathematical programming
Transverse-field Ising model	Example	Statistical mechanics, structure of matter
Physical geodesy	Concept	Geophysics
Harmonic functions on Riemannian manifolds	Concept	Potential theory
Riemann invariants	Definition	Partial differential equations
Hausdorff summation	Concept	Sequences, series, summability
Uniform polytope	Definition	Geometry
Similarity transformation	Definition	Geometry
Identity	Concept	General algebraic systems
Linear regression	Definition	Statistics
Mercer's theorem	Theorem	Integral equations
Semihereditary ring	Definition	Associative rings and algebras
Nielsen–Thurston classification	Theorem	Manifolds and cell complexes
Spherical astronomy	Definition	Astronomy and astrophysics
Non-measurable set	Concept	Measure and integration
Bromwich justification of the Heaviside calculus	Definition	Integral transforms, operational calculus
Atiyah–Bott fixed-point theorem	Theorem	Global analysis, analysis on manifolds
Concatenated code	Definition	Information and communication theory, circuits
Lauricella hypergeometric series	Definition	Special functions
Spin foam	Definition	Relativity and gravitational theory
Knuth–Morris–Pratt algorithm	Concept	Computer science
Computational fluid dynamics	Definition	Fluid mechanics
Engel subalgebra	Concept	Nonassociative rings and algebras
Optimal experimental design	Concept	Statistics
Valuation on convex bodies	Definition	Convex and discrete geometry
Sub-Gaussian distribution	Definition	Probability theory and stochastic processes
Lattice Boltzmann method	Concept	Fluid mechanics
Petersen's theorem	Theorem	Combinatorics
q-derivative	Concept	Combinatorics
Littlewood subordination theorem	Theorem	Functions of a complex variable
Crossed product algebra	Definition	Associative rings and algebras
Quasisymmetric map	Definition	Functions of a complex variable
Pentagonal number theorem	Theorem	Number theory
Euler's equations of rigid body motion	Theorem	Mechanics of particles and systems
Normal complex space	Concept	Several complex variables and analytic spaces
Spacetime interval	Concept	Relativity and gravitational theory
Noetherian module	Definition	Commutative algebra
Airy equation	Example	Ordinary differential equations
k-means clustering	Definition	Statistics
Peierls argument	Theorem	Statistical mechanics, structure of matter
Hopf surface	Example	Several complex variables and analytic spaces
Strongly minimal theory	Concept	Mathematical logic and foundations
Stratified sampling	Concept	Statistics
Hardy space	Concept	Functions of a complex variable
Liouville–Arnold theorem	Theorem	Dynamical systems and ergodic theory
Simson line	Concept	Geometry
Faithful module	Definition	Associative rings and algebras
Fredholm equation of the second kind	Definition	Integral equations
Slice knot	Definition	Manifolds and cell complexes
Dyson series	Concept	Quantum theory
Positive definiteness of the energy	Theorem	Potential theory
Krull dimension of a noncommutative ring	Concept	Associative rings and algebras
Bayes estimator	Concept	Statistics
Peaucellier–Lipkin linkage	Object	Mechanics of particles and systems
Butterfly effect	Definition	Dynamical systems and ergodic theory
Lagrange multipliers for constraints	Definition	Mechanics of particles and systems
Stochastic dynamic programming	Definition	Operations research, mathematical programming
Harmonic coordinate condition	Concept	Relativity and gravitational theory
Horocycle	Definition	Geometry
Computable set	Concept	Mathematical logic and foundations
Blahut–Arimoto algorithm	Concept	Information and communication theory, circuits
Friedmann equations	Theorem	Relativity and gravitational theory
Berlekamp–Massey algorithm	Definition	Information and communication theory, circuits
Cole–Hopf transformation	Definition	Partial differential equations
Deflection of the vertical	Definition	Geophysics
Calderón–Zygmund kernel	Definition	Harmonic analysis on Euclidean spaces
Gibbard's theorem	Theorem	Game theory, economics, finance, and other social and behavioral sciences
Cauchy–Riemann operator	Concept	Several complex variables and analytic spaces
Reproducing kernel Hilbert space	Definition	Functional analysis
Quadratic transformations of hypergeometric functions	Theorem	Special functions
Field of extremals	Definition	Calculus of variations and optimal control; optimization
Strain tensor	Definition	Mechanics of deformable solids
Dixon elliptic functions	Concept	Special functions