Every idea

Ideas 15901–16050 of 19875.

Name	Kind	Subject
Cylindric algebra	Definition	Mathematical logic and foundations
Matrix summability method	Definition	Sequences, series, summability
Segre embedding	Example	Algebraic geometry
Dirichlet's principle	Theorem	Potential theory
Mackey–Arens theorem	Theorem	Functional analysis
Representation ring	Concept	K-theory
Fermat's principle	Fact	Optics, electromagnetic theory
Local homomorphism	Definition	Commutative algebra
Pure and mixed strategy	Definition	Game theory, economics, finance, and other social and behavioral sciences
Complete elliptic integral of the first kind	Concept	Special functions
Dedekind's problem	Problem	Order, lattices, ordered algebraic structures
Shear modulus	Definition	Mechanics of deformable solids
Turing pattern	Concept	Partial differential equations
Ornstein–Zernike correlation decay	Theorem	Statistical mechanics, structure of matter
Wave function collapse	Concept	Quantum theory
Tomita–Takesaki theory	Definition	Functional analysis
Analemma	Example	Astronomy and astrophysics
Hilbert polynomial	Concept	Commutative algebra
Borel hierarchy	Definition	Mathematical logic and foundations
Linear temporal logic	Concept	Mathematical logic and foundations
Kelvin–Planck statement of the second law	Fact	Classical thermodynamics, heat transfer
Newsvendor model	Problem	Operations research, mathematical programming
Saturated model	Concept	Mathematical logic and foundations
Character of a representation	Concept	Group theory and generalizations
Biological neuron model	Concept	Biology and other natural sciences
Bartle–Dunford–Schwartz integral	Concept	Functional analysis
Rado graph	Object	Combinatorics
Analyticity of the bilateral Laplace transform of a law	Theorem	Integral transforms, operational calculus
Yee lattice	Definition	Optics, electromagnetic theory
Semicontinuity	Concept	General topology
Tychonoff's non-uniqueness example	Counterexample	Partial differential equations
Gelfond–Schneider theorem	Theorem	Number theory
Stereographic projection	Definition	Functions of a complex variable
Soliton	Definition	Partial differential equations
Kan extension	Concept	Category theory; homological algebra
Sokhotski–Plemelj theorem	Theorem	Functions of a complex variable
Finitely complete category	Definition	Category theory; homological algebra
Euler characteristic	Concept	Algebraic topology
Mosco convergence	Definition	Calculus of variations and optimal control; optimization
Hyperoval	Concept	Geometry
Batalin–Vilkovisky formalism	Definition	Quantum theory
Geodesics in general relativity	Concept	Relativity and gravitational theory
Brunn–Minkowski theory	Concept	Convex and discrete geometry
Semilattice	Definition	Order, lattices, ordered algebraic structures
Risk function	Definition	Statistics
Leslie matrix	Concept	Biology and other natural sciences
Strictly singular operator	Concept	Operator theory
Henselian ring	Concept	Commutative algebra
Climate sensitivity	Concept	Geophysics
Bitonic sorter	Concept	Computer science
Lattice of stable matchings	Theorem	Game theory, economics, finance, and other social and behavioral sciences
Orbifold	Concept	Manifolds and cell complexes
Homomorphic encryption	Concept	Information and communication theory, circuits
Constant-mean-curvature surface	Concept	Differential geometry
Littlewood polynomial	Definition	Harmonic analysis on Euclidean spaces
Halley's method	Theorem	Numerical analysis
c-cyclical monotonicity	Concept	Calculus of variations and optimal control; optimization
Mellin transform of a power times a function	Proposition	Integral transforms, operational calculus
Singularity of a smooth map	Definition	Global analysis, analysis on manifolds
SIS and SEIR models	Definition	Biology and other natural sciences
Kardar–Parisi–Zhang equation	Concept	Probability theory and stochastic processes
Spectral theory	Definition	Operator theory
Volterra series	Concept	Systems theory; control
Dodgson condensation	Concept	Linear and multilinear algebra; matrix theory
Archimedean equivalence classes	Concept	Order, lattices, ordered algebraic structures
Quasicrystal	Concept	Convex and discrete geometry
Bang–bang control	Definition	Calculus of variations and optimal control; optimization
Strictly convex space	Definition	Functional analysis
Mean-periodic function	Definition	Harmonic analysis on Euclidean spaces
Law of the iterated logarithm	Theorem	Probability theory and stochastic processes
Taylor–Proudman theorem	Theorem	Fluid mechanics
Ring of invariants	Definition	Commutative algebra
Stable vector bundle	Concept	Algebraic geometry
Mazur's torsion theorem	Theorem	Number theory
Nucleolus	Definition	Game theory, economics, finance, and other social and behavioral sciences
Initial value formulation of general relativity	Definition	Relativity and gravitational theory
Injective tensor product	Concept	Functional analysis
Borel summation	Definition	Sequences, series, summability
Intuitionism	Definition	Mathematical logic and foundations
Askey scheme	Concept	Special functions
Stiff equation	Concept	Numerical analysis
Baire property	Definition	General topology
Long branch attraction	Counterexample	Biology and other natural sciences
Moduli of algebraic curves	Definition	Algebraic geometry
Normal coordinates	Concept	Differential geometry
Ample line bundle	Concept	Algebraic geometry
Particle horizon	Definition	Relativity and gravitational theory
Asymptotic freedom	Theorem	Quantum theory
Common knowledge	Definition	Mathematical logic and foundations
Symmetric and self-reciprocal kernels	Concept	Integral transforms, operational calculus
Normal number	Definition	Number theory
Riemann's differential equation	Concept	Special functions
Second variation	Definition	Calculus of variations and optimal control; optimization
Integrable function	Definition	Measure and integration
Gromov's theorem on groups of polynomial growth	Theorem	Group theory and generalizations
Division algebra	Definition	Nonassociative rings and algebras
Scheme	Definition	Algebraic geometry
Eilenberg swindle	Concept	Associative rings and algebras
Appell's equation of motion	Theorem	Mechanics of particles and systems
Askey–Wilson polynomials	Concept	Special functions
Spin structure	Concept	Differential geometry
Krein–Milman theorem	Theorem	Functional analysis
Clifford's theorem on special divisors	Theorem	Algebraic geometry
Dissipative system	Concept	Systems theory; control
Fuller's phenomenon	Example	Calculus of variations and optimal control; optimization
Stochastic game	Concept	Game theory, economics, finance, and other social and behavioral sciences
Duhamel–Neumann law	Fact	Mechanics of deformable solids
Critical exponent	Definition	Statistical mechanics, structure of matter
Köthe conjecture	Conjecture	Associative rings and algebras
Associator	Concept	Nonassociative rings and algebras
Apéry's theorem	Theorem	Number theory
Equidistribution modulo one	Definition	Number theory
Sheaf on a site	Concept	Category theory; homological algebra
Harmonic functions on Riemann surfaces	Definition	Functions of a complex variable
Chebyshev polynomials of the second kind	Definition	Special functions
Legendrian submanifold	Definition	Differential geometry
Petrov–Galerkin method	Theorem	Numerical analysis
Devaney chaos	Definition	Dynamical systems and ergodic theory
Set theory	Concept	Mathematical logic and foundations
Coupled map lattice	Definition	Dynamical systems and ergodic theory
Atomic domain	Definition	Commutative algebra
Floating-point arithmetic	Concept	Numerical analysis
Semiautomaton as a unary algebra	Example	General algebraic systems
Mesh generation	Concept	Numerical analysis
Nerve of a category	Concept	Category theory; homological algebra
BCJR algorithm	Concept	Information and communication theory, circuits
Multidimensional Mellin transform	Definition	Integral transforms, operational calculus
Almgren's regularity theorem	Theorem	Calculus of variations and optimal control; optimization
Nagaoka ferromagnetism	Theorem	Statistical mechanics, structure of matter
Global field	Definition	Number theory
Kleene star	Definition	Computer science
Natural density	Concept	Number theory
Hamilton's rule	Proposition	Biology and other natural sciences
Embedded prime	Concept	Commutative algebra
Hessenberg matrix	Definition	Linear and multilinear algebra; matrix theory
Infinite Galois theory	Concept	Field theory and polynomials
Partial correlation	Definition	Statistics
Rational variety	Definition	Algebraic geometry
Epimorphism	Concept	Category theory; homological algebra
Carleman's condition	Theorem	Integral transforms, operational calculus
Euler equations	Concept	Partial differential equations
Proof of the uniqueness of inverses	Proof	Group theory and generalizations
Oort constants	Definition	Astronomy and astrophysics
Jordan–Dedekind chain condition	Concept	Order, lattices, ordered algebraic structures
Group action on a variety	Concept	Algebraic geometry
Differential Galois theory	Definition	Field theory and polynomials
Four-dimensional variational assimilation	Concept	Geophysics
Singular simplicial set	Concept	Algebraic topology
Perfect fluid	Definition	Relativity and gravitational theory
Gauss's law	Theorem	Optics, electromagnetic theory