Every idea

Ideas 16051–16200 of 19838.

Name	Kind	Subject
Height function	Definition	Number theory
Phyllotaxis and the golden angle	Proposition	Biology and other natural sciences
Euler's theorem on normal curvatures	Theorem	Differential geometry
Adjunction formula	Theorem	Algebraic geometry
Additive white Gaussian noise channel	Example	Information and communication theory, circuits
Calderón–Zygmund estimates	Theorem	Partial differential equations
Cheap talk	Concept	Game theory, economics, finance, and other social and behavioral sciences
Closed-loop transfer function	Concept	Systems theory; control
Infinite product	Definition	Sequences, series, summability
Nef line bundle	Concept	Algebraic geometry
Many-body localization	Definition	Statistical mechanics, structure of matter
Nonlinear control	Concept	Systems theory; control
Hamming bound	Theorem	Information and communication theory, circuits
Contingency table	Definition	Statistics
Electromagnetic four-potential	Definition	Optics, electromagnetic theory
An infinite product converges iff its series of logarithms converges	Proposition	Sequences, series, summability
Johnson's theorem on amenable group algebras	Theorem	Abstract harmonic analysis
Schauder basis	Definition	Functional analysis
Wigner–Eckart theorem	Theorem	Quantum theory
Finite-difference time-domain method	Definition	Optics, electromagnetic theory
Abel–Poisson summation of Fourier series	Concept	Harmonic analysis on Euclidean spaces
Cramér's theorem	Theorem	Probability theory and stochastic processes
Zak transform	Concept	Harmonic analysis on Euclidean spaces
Nilpotent Lie group	Definition	Topological groups, Lie groups
Elastic collision	Definition	Mechanics of particles and systems
Dimensional regularization	Definition	Quantum theory
Median algebra as a ternary algebra	Example	General algebraic systems
Affine term structure model	Definition	Game theory, economics, finance, and other social and behavioral sciences
Mean-field game	Definition	Game theory, economics, finance, and other social and behavioral sciences
Dehn invariant	Concept	Convex and discrete geometry
Bochner–Riesz conjecture	Conjecture	Harmonic analysis on Euclidean spaces
Seifert–van Kampen theorem	Theorem	Manifolds and cell complexes
Erdős–Rado theorem	Theorem	Mathematical logic and foundations
Oka principle	Theorem	Several complex variables and analytic spaces
Uncertainty principle in Fourier analysis	Theorem	Harmonic analysis on Euclidean spaces
Compartmental models in epidemiology	Definition	Biology and other natural sciences
Exact functor	Concept	Category theory; homological algebra
Microstate	Concept	Statistical mechanics, structure of matter
Kirchhoff's matrix tree theorem	Theorem	Combinatorics
Jeans instability	Proposition	Astronomy and astrophysics
Quintic equation	Example	Field theory and polynomials
Fundamental group	Concept	Algebraic topology
Octonionic projective plane	Example	Geometry
Tessellation	Definition	Convex and discrete geometry
Optimal control of partial differential equations	Concept	Calculus of variations and optimal control; optimization
Birch–Tate conjecture	Conjecture	Number theory
Suspension flow	Definition	Dynamical systems and ergodic theory
Minimal prime ideal	Concept	Commutative algebra
Karoubi envelope	Concept	Category theory; homological algebra
Minlos theorem	Theorem	Measure and integration
Schlegel diagram	Concept	Convex and discrete geometry
Socle of a module	Concept	Associative rings and algebras
Affine plane over a finite field	Example	Geometry
Lovász bound on the Shannon capacity	Theorem	Combinatorics
Hardy spaces of harmonic functions	Definition	Potential theory
Gordon–Newell theorem	Theorem	Probability theory and stochastic processes
Hopf's formula	Theorem	Group theory and generalizations
Axiom A	Definition	Dynamical systems and ergodic theory
Sheaf of modules	Concept	Algebraic geometry
Polyconvexity	Definition	Calculus of variations and optimal control; optimization
Localization of a module	Definition	Commutative algebra
Circle packing	Concept	Convex and discrete geometry
Hereditary ring	Definition	Associative rings and algebras
Fourier series	Definition	Harmonic analysis on Euclidean spaces
Zero divisors are the union of associated primes	Theorem	Commutative algebra
Root locus	Definition	Systems theory; control
Faraday effect	Definition	Optics, electromagnetic theory
Ginzburg criterion	Fact	Statistical mechanics, structure of matter
Countably compact space	Concept	General topology
Mixing	Concept	Dynamical systems and ergodic theory
Lorentz force	Fact	Optics, electromagnetic theory
Kermack–McKendrick theory	Theorem	Biology and other natural sciences
Birkhoff sum and average	Definition	Dynamical systems and ergodic theory
Grothendieck topos	Concept	Category theory; homological algebra
Kernel	Concept	Category theory; homological algebra
ElGamal encryption	Definition	Information and communication theory, circuits
Inertia tensor and principal axes	Definition	Mechanics of particles and systems
Submanifold	Definition	Global analysis, analysis on manifolds
Thermodynamic square	Concept	Classical thermodynamics, heat transfer
Comonad	Definition	Category theory; homological algebra
Levi-flat hypersurface	Concept	Several complex variables and analytic spaces
Tsirelson space	Example	Functional analysis
Torsion of a curve	Concept	Differential geometry
Ambient noise seismic interferometry	Concept	Geophysics
Bol loop	Concept	Group theory and generalizations
Radical ideal	Concept	Commutative algebra
Continuum mechanics	Definition	Mechanics of deformable solids
Silverman–Toeplitz theorem	Theorem	Sequences, series, summability
Semantic security	Definition	Information and communication theory, circuits
Stone's representation theorem for Boolean algebras	Theorem	Order, lattices, ordered algebraic structures
Quasiconvex function	Concept	Real functions
Hecke operator	Concept	Number theory
Time-variant system	Concept	Systems theory; control
Rankine–Hugoniot conditions	Theorem	Partial differential equations
Cryptographic hash function	Definition	Information and communication theory, circuits
Product	Concept	Category theory; homological algebra
Edwards–Anderson model	Example	Statistical mechanics, structure of matter
Hochschild homology	Concept	Associative rings and algebras
Cournot competition	Concept	Game theory, economics, finance, and other social and behavioral sciences
Period-doubling bifurcation	Definition	Dynamical systems and ergodic theory
Tolman surface brightness test	Theorem	Astronomy and astrophysics
Double-couple source	Concept	Geophysics
Haar measure on a Lie group	Definition	Topological groups, Lie groups
Group of Lie type	Definition	Group theory and generalizations
Error exponent	Concept	Information and communication theory, circuits
Barnes–Hut simulation	Definition	Astronomy and astrophysics
Fox H-function transforms	Concept	Integral transforms, operational calculus
Orthogonality of characters	Theorem	Abstract harmonic analysis
Skew polynomial ring	Concept	Associative rings and algebras
Fiber product of schemes	Definition	Algebraic geometry
Shanks transformation	Definition	Numerical analysis
Relaxation of a variational problem	Definition	Calculus of variations and optimal control; optimization
Shapley–Shubik power index	Definition	Game theory, economics, finance, and other social and behavioral sciences
Unique factorization of ideals in a Dedekind domain	Theorem	Commutative algebra
Survival analysis	Definition	Statistics
Multiplicative decomposition of the deformation gradient	Concept	Mechanics of deformable solids
Thermal radiation	Concept	Classical thermodynamics, heat transfer
Arithmetic progression	Example	Number theory
Electroactive polymer	Concept	Mechanics of deformable solids
Hardy's inequality	Theorem	Real functions
Revenue equivalence theorem	Theorem	Game theory, economics, finance, and other social and behavioral sciences
Bidiagonalization	Theorem	Numerical analysis
Class operators H S P	Concept	General algebraic systems
Shannon capacity of a graph	Concept	Combinatorics
K-epsilon turbulence model	Concept	Fluid mechanics
Schechter luminosity function	Definition	Astronomy and astrophysics
Green's relations	Concept	Group theory and generalizations
Heat engine	Concept	Classical thermodynamics, heat transfer
Operator space	Definition	Operator theory
Lovász extension	Definition	Operations research, mathematical programming
Quantum circuit	Concept	Quantum theory
Supersymmetry	Concept	Quantum theory
BRST quantization	Definition	Quantum theory
Riccati difference equation	Definition	Difference and functional equations
Frank-Kamenetskii theory of thermal explosion	Concept	Classical thermodynamics, heat transfer
Toda bracket	Definition	Algebraic topology
Incidence structure	Definition	Geometry
Principal symbol of an operator on a manifold	Concept	Global analysis, analysis on manifolds
Bernstein algebra	Concept	Nonassociative rings and algebras
Thermodynamic work	Concept	Classical thermodynamics, heat transfer
Båth's law	Fact	Geophysics
Pareto front	Definition	Operations research, mathematical programming
Laplace's equation	Concept	Partial differential equations
Four-vector	Concept	Relativity and gravitational theory
Brown–Peterson cohomology	Concept	Algebraic topology
Persistent homology	Concept	Algebraic topology
Foliation	Definition	Manifolds and cell complexes
Selberg integral	Theorem	Special functions
Prime model	Concept	Mathematical logic and foundations
Chebyshev's sum inequality	Theorem	Real functions