Every idea

Ideas 15151–15300 of 19838.

Name	Kind	Subject
Substitution matrix	Concept	Biology and other natural sciences
One-way function	Definition	Information and communication theory, circuits
Leptin's theorem	Theorem	Abstract harmonic analysis
Polyakov action	Definition	Quantum theory
Biorthogonal wavelet	Concept	Harmonic analysis on Euclidean spaces
Lagrange multipliers on Banach spaces	Theorem	Calculus of variations and optimal control; optimization
Suspension	Concept	Algebraic topology
Feigenbaum–Cvitanović functional equation	Concept	Dynamical systems and ergodic theory
Anharmonic oscillator	Definition	Mechanics of particles and systems
Polynomial identity ring	Definition	Associative rings and algebras
Inductive type	Concept	Mathematical logic and foundations
Lévy–Khintchine representation	Theorem	Probability theory and stochastic processes
Ecliptic coordinate system	Definition	Astronomy and astrophysics
Sentence	Definition	Mathematical logic and foundations
Bianchi classification	Theorem	Nonassociative rings and algebras
Stochastic dominance	Definition	Probability theory and stochastic processes
Helson–Lowdenslager theorem	Theorem	Abstract harmonic analysis
Snake lemma	Lemma	Category theory; homological algebra
Minimal model program	Concept	Algebraic geometry
Acceleration	Concept	Mechanics of particles and systems
Bicubic interpolation	Definition	Numerical analysis
Carathéodory's extension theorem	Theorem	Measure and integration
Mutually singular measures	Definition	Measure and integration
Banach–Stone theorem	Theorem	Functional analysis
Bloch–Wigner function	Concept	Special functions
Cosmological principle	Concept	Relativity and gravitational theory
Elastic net	Definition	Statistics
Somigliana identity	Theorem	Mechanics of deformable solids
Gödel's consistency of CH and AC	Theorem	Mathematical logic and foundations
Quasispecies model	Definition	Biology and other natural sciences
Near-ring	Definition	Associative rings and algebras
Eshelby energy-momentum tensor	Concept	Mechanics of deformable solids
Strong amalgamation property	Concept	General algebraic systems
Kempner series	Example	Sequences, series, summability
Periodicity equation	Definition	Difference and functional equations
Hertz vector	Definition	Optics, electromagnetic theory
Quicksort	Concept	Computer science
Germ of an analytic set	Concept	Several complex variables and analytic spaces
Coifman–Rochberg–Weiss commutator theorem	Theorem	Harmonic analysis on Euclidean spaces
Photon sphere	Definition	Relativity and gravitational theory
Bialgebra	Concept	Associative rings and algebras
Quantum invariant of 3-manifolds	Definition	Manifolds and cell complexes
Order (ring theory)	Definition	Associative rings and algebras
BCM theory	Concept	Biology and other natural sciences
Morse theory on Hilbert manifolds	Definition	Global analysis, analysis on manifolds
Perfectoid space	Concept	Algebraic geometry
Spectral risk measure	Concept	Game theory, economics, finance, and other social and behavioral sciences
Paley–Wiener theorem for symmetric spaces	Theorem	Abstract harmonic analysis
Geometric algebra	Definition	Linear and multilinear algebra; matrix theory
Quantum chaos	Definition	Quantum theory
Alexandrov space	Definition	Differential geometry
Holomorphic line bundle	Concept	Several complex variables and analytic spaces
Rubio de Francia extrapolation theorem	Theorem	Harmonic analysis on Euclidean spaces
Tor functor	Definition	Commutative algebra
Baroclinic instability	Definition	Fluid mechanics
Primitive equations	Concept	Geophysics
Riesz mean	Definition	Sequences, series, summability
Congruence-modular variety	Concept	General algebraic systems
El Niño–Southern Oscillation models	Definition	Geophysics
Elastic metamaterial	Concept	Mechanics of deformable solids
Generalized Lotka–Volterra equation	Definition	Biology and other natural sciences
Lusternik–Schnirelmann theory of critical points	Concept	Global analysis, analysis on manifolds
Weierstrass zeta and sigma functions	Concept	Special functions
Murray–von Neumann classification of factors	Theorem	Functional analysis
Magnetic helicity	Definition	Optics, electromagnetic theory
Permuting congruences	Definition	General algebraic systems
Mixed volume	Concept	Convex and discrete geometry
Krylov subspace	Concept	Numerical analysis
Hahn–Banach theorem	Theorem	Functional analysis
Simple function	Definition	Measure and integration
Fictitious play	Concept	Game theory, economics, finance, and other social and behavioral sciences
Free object	Concept	Category theory; homological algebra
Equatorial coordinate system	Concept	Astronomy and astrophysics
Exactly solvable model	Definition	Statistical mechanics, structure of matter
Finitely generated variety	Definition	General algebraic systems
Siciak extremal function	Concept	Several complex variables and analytic spaces
Double complex	Definition	Category theory; homological algebra
Stability of Volterra equations	Definition	Integral equations
HOMFLY polynomial	Concept	Manifolds and cell complexes
Featherstone's algorithm	Definition	Mechanics of particles and systems
Annihilator method	Definition	Ordinary differential equations
Boundary layer	Definition	Ordinary differential equations
Hilbertian field	Definition	Field theory and polynomials
Moment tensor	Definition	Geophysics
Mechanical similarity	Definition	Mechanics of particles and systems
Dixon's identity	Theorem	Special functions
Banach–Mazur theorem	Theorem	Functional analysis
Lamb waves	Concept	Mechanics of deformable solids
Lindenbaum–Tarski algebra	Concept	Mathematical logic and foundations
Separably generated extension	Definition	Field theory and polynomials
Hopf–Rinow theorem	Theorem	Differential geometry
Kuratowski's closure-complement problem	Problem	General topology
Precession	Definition	Mechanics of particles and systems
Injective hull	Concept	Commutative algebra
Generic smoothness	Theorem	Algebraic geometry
Martin boundary	Concept	Potential theory
Integral transforms of tempered distributions	Concept	Functional analysis
Lidskii's theorem	Theorem	Operator theory
Modified nodal analysis	Concept	Information and communication theory, circuits
Orbital elements	Definition	Mechanics of particles and systems
Thin-film interference	Definition	Optics, electromagnetic theory
Preservation of limits	Definition	Category theory; homological algebra
Rayleigh's principle for natural frequencies	Theorem	Mechanics of particles and systems
Topological index	Concept	Global analysis, analysis on manifolds
Standard probability space	Concept	Measure and integration
Palatini variation	Concept	Relativity and gravitational theory
Frobenius theorem on real division algebras	Theorem	Associative rings and algebras
Ring of sets	Definition	Measure and integration
Voronoi diagram	Concept	Convex and discrete geometry
Hammerstein integral equation	Definition	Integral equations
Snell's law	Fact	Optics, electromagnetic theory
Structure theorem for compactly generated LCA groups	Theorem	Topological groups, Lie groups
Van der Corput lemma	Lemma	Harmonic analysis on Euclidean spaces
Green's identities	Theorem	Potential theory
Differential entropy	Definition	Information and communication theory, circuits
Allard regularity theorem	Theorem	Calculus of variations and optimal control; optimization
Finite difference coefficients	Definition	Numerical analysis
Karoubi–Villamayor K-theory	Concept	K-theory
Scaling rule for the Laplace transform	Proposition	Integral transforms, operational calculus
Least harmonic majorant	Definition	Potential theory
Electrical resistivity tomography	Concept	Geophysics
Tidal acceleration	Concept	Mechanics of particles and systems
Taylor term	Concept	General algebraic systems
Horvitz–Thompson estimator	Concept	Statistics
Narasimhan lemma	Lemma	Several complex variables and analytic spaces
Lommel function	Definition	Special functions
Reductive Lie group	Definition	Topological groups, Lie groups
Operator theory	Definition	Operator theory
Method of characteristics in gas dynamics	Definition	Fluid mechanics
Triple point	Concept	Classical thermodynamics, heat transfer
't Hooft–Polyakov monopole	Object	Quantum theory
Kelvin wave	Concept	Fluid mechanics
Plancherel measure	Concept	Abstract harmonic analysis
Ahlfors theory	Definition	Functions of a complex variable
P-wave	Definition	Mechanics of deformable solids
Rademacher's theorem	Theorem	Real functions
Vanishing cycle	Definition	Several complex variables and analytic spaces
Double-negation translation	Definition	Mathematical logic and foundations
Fundamental theorem of linear programming	Theorem	Operations research, mathematical programming
Deceleration parameter	Concept	Relativity and gravitational theory
Blakers–Massey theorem	Theorem	Algebraic topology
Forced convection	Concept	Fluid mechanics
Goldie ring	Concept	Associative rings and algebras
Graph minor	Definition	Combinatorics
Endomorphism monoid	Concept	General algebraic systems
Bohr–Mollerup theorem	Theorem	Special functions
Spectral method	Definition	Numerical analysis
Poles of the gamma function	Theorem	Special functions
Parker instability	Concept	Astronomy and astrophysics
Signorini problem	Problem	Mechanics of deformable solids