Every idea

Ideas 19201–19350 of 19934.

Name	Kind	Subject
Harish-Chandra isomorphism	Theorem	Nonassociative rings and algebras
Frequentist inference	Definition	Statistics
Incidence matrix	Definition	Combinatorics
Harnack's inequality	Theorem	Potential theory
Gumm terms	Definition	General algebraic systems
Restricted Lie algebra	Definition	Nonassociative rings and algebras
Kappa mechanism	Definition	Astronomy and astrophysics
Synchronization of chaos	Concept	Ordinary differential equations
Nonassociative ring	Concept	Nonassociative rings and algebras
Chevalley group	Concept	Group theory and generalizations
Integer factorization	Problem	Number theory
Affine arithmetic	Concept	Numerical analysis
Approximation theory	Concept	Approximations and expansions
Subfactor	Definition	Functional analysis
1 + 1 + 1 + 1 + ⋯	Example	Sequences, series, summability
Verma module	Definition	Nonassociative rings and algebras
Equation of state	Concept	Classical thermodynamics, heat transfer
Baker–Gammel–Wills conjecture	Conjecture	Approximations and expansions
Hurwitz zeta function	Definition	Number theory
Energy cascade	Concept	Fluid mechanics
Locally finite measure	Concept	Measure and integration
Finitely presented module	Definition	Commutative algebra
Commutant	Definition	Functional analysis
Statics	Definition	Mechanics of particles and systems
Functional inequality	Concept	Difference and functional equations
Reversible process	Definition	Classical thermodynamics, heat transfer
Shamir's secret sharing	Definition	Information and communication theory, circuits
Chern–Connes character	Definition	Functional analysis
Underactuated system	Definition	Mechanics of particles and systems
Rigorous coupled-wave analysis	Definition	Optics, electromagnetic theory
Artinian module	Concept	Associative rings and algebras
Hahn series	Concept	Commutative algebra
Bessel polynomials	Definition	Special functions
BGK collision operator	Concept	Statistical mechanics, structure of matter
Taylor microscale	Definition	Fluid mechanics
Observability	Definition	Systems theory; control
Coherent risk measure	Concept	Game theory, economics, finance, and other social and behavioral sciences
Diagonally dominant matrix	Definition	Linear and multilinear algebra; matrix theory
Free boundary problem	Problem	Partial differential equations
Controllability	Definition	Systems theory; control
Likelihood principle	Axiom	Statistics
Model complete theory	Concept	Mathematical logic and foundations
Functional differential equation	Definition	Ordinary differential equations
Nevanlinna parametrization of solutions	Theorem	Integral transforms, operational calculus
Koszul algebra	Definition	Associative rings and algebras
Helioseismology	Definition	Astronomy and astrophysics
Kolmogorov automorphism	Concept	Dynamical systems and ergodic theory
Descriptive complexity theory	Concept	Computer science
Integro-differential equation	Concept	Integral equations
Adapted process	Concept	Probability theory and stochastic processes
Octonion algebra	Definition	Nonassociative rings and algebras
DeGroot learning	Concept	Game theory, economics, finance, and other social and behavioral sciences
Euler angles	Definition	Mechanics of particles and systems
Order of an entire function	Definition	Functions of a complex variable
Convex body	Definition	Convex and discrete geometry
Fluctuation–dissipation theorem	Theorem	Statistical mechanics, structure of matter
Tarski's undefinability theorem	Theorem	Mathematical logic and foundations
Dundas–Goodwillie–McCarthy theorem	Theorem	K-theory
Michell structures	Example	Mechanics of deformable solids
Elastic wave scattering	Concept	Mechanics of deformable solids
Three-term recurrence for orthogonal polynomials	Theorem	Harmonic analysis on Euclidean spaces
K2 and the Brauer group	Proposition	K-theory
Gaussian binomial coefficient	Concept	Combinatorics
Transmission line	Concept	Optics, electromagnetic theory
Nonlinear approximation	Concept	Approximations and expansions
Osterwalder–Schrader reconstruction theorem	Theorem	Quantum theory
Curse of dimensionality	Concept	Numerical analysis
Axiomatic potential theory	Concept	Potential theory
Nome	Concept	Special functions
Lambert summation	Definition	Sequences, series, summability
Schützenberger's theorem on star-free languages	Theorem	Computer science
Ruin theory	Concept	Game theory, economics, finance, and other social and behavioral sciences
Celestial coordinate system	Concept	Astronomy and astrophysics
Weyl group	Concept	Nonassociative rings and algebras
Fuchsian equation	Definition	Ordinary differential equations
Compact quantum group	Definition	Functional analysis
Zeta-regularized determinant	Concept	Global analysis, analysis on manifolds
Annihilator duality	Theorem	Abstract harmonic analysis
Product order	Definition	Order, lattices, ordered algebraic structures
Nevanlinna characteristic	Concept	Functions of a complex variable
Isochoric process	Concept	Classical thermodynamics, heat transfer
Competitive equilibrium	Concept	Game theory, economics, finance, and other social and behavioral sciences
Mirror descent	Definition	Operations research, mathematical programming
Expansion in spherical harmonics	Theorem	Potential theory
Time-optimal control	Problem	Calculus of variations and optimal control; optimization
Classifying topos	Definition	Category theory; homological algebra
Euler free nutation	Definition	Mechanics of particles and systems
Mellin transform of a dilation	Proposition	Integral transforms, operational calculus
Crystal plasticity	Concept	Mechanics of deformable solids
Quasi-everywhere	Definition	Potential theory
Vaught conjecture	Conjecture	Mathematical logic and foundations
Clenshaw–Curtis quadrature	Definition	Numerical analysis
Mersenne Twister	Object	Numerical analysis
Continuous and residual spectrum	Concept	Operator theory
Simplicial polytope	Concept	Convex and discrete geometry
Worm-like chain	Example	Statistical mechanics, structure of matter
Proof that every vector space has a basis, by Zorn's lemma	Proof	Linear and multilinear algebra; matrix theory
Lieb–Liniger model	Example	Statistical mechanics, structure of matter
Surreal number	Object	Order, lattices, ordered algebraic structures
Valuation ring	Definition	Commutative algebra
d'Alembert's formula	Theorem	Partial differential equations
Burke's theorem	Theorem	Probability theory and stochastic processes
Twistor theory	Concept	Several complex variables and analytic spaces
Grand potential	Definition	Classical thermodynamics, heat transfer
Black hole	Definition	Relativity and gravitational theory
Topology of uniform convergence	Concept	General topology
Jacobi field	Definition	Differential geometry
Deformation retract	Definition	General topology
Club set	Concept	Mathematical logic and foundations
Output controllability	Concept	Systems theory; control
Toric variety	Concept	Algebraic geometry
Instanton	Concept	Differential geometry
Isomorphism	Definition	General algebraic systems
Oriented matroid	Definition	Convex and discrete geometry
Chebyshev nodes	Definition	Numerical analysis
Weierstrass–Enneper parameterization	Theorem	Differential geometry
Uniform space	Definition	General topology
Trace form	Concept	Field theory and polynomials
Smn theorem	Theorem	Mathematical logic and foundations
Vickrey–Clarke–Groves mechanism	Concept	Game theory, economics, finance, and other social and behavioral sciences
Rate of convergence	Concept	Sequences, series, summability
Koszul duality	Definition	Associative rings and algebras
Simplex	Concept	Geometry
Loewner differential equation	Definition	Functions of a complex variable
Exceptional Lie group G2	Example	Topological groups, Lie groups
Hadwiger–Nelson problem	Problem	Combinatorics
Stochastic volatility	Definition	Game theory, economics, finance, and other social and behavioral sciences
Uniform module	Concept	Associative rings and algebras
Sorting network	Definition	Computer science
Regularity of minimizers	Definition	Calculus of variations and optimal control; optimization
Limiting subdifferential	Definition	Calculus of variations and optimal control; optimization
Riesz potential operator	Definition	Operator theory
Group cohomology	Concept	Group theory and generalizations
Method of moments in electromagnetics	Concept	Optics, electromagnetic theory
Projective object	Concept	Category theory; homological algebra
Inversion in a circle	Concept	Geometry
Arakelov theory	Concept	Algebraic geometry
Vincenty's formulae	Concept	Geophysics
Classification of covering spaces	Theorem	Manifolds and cell complexes
Analysis on fractals	Concept	Potential theory
Fractional differential equation	Concept	Ordinary differential equations
BCH code	Concept	Information and communication theory, circuits
Local truncation error	Definition	Numerical analysis
Gelfand–Kirillov dimension	Definition	Associative rings and algebras
Bunimovich stadium	Example	Dynamical systems and ergodic theory
Bose–Einstein condensation	Proposition	Statistical mechanics, structure of matter
Kirby–Siebenmann class	Definition	Manifolds and cell complexes
J-homomorphism	Concept	Algebraic topology
Okubo algebra	Object	Nonassociative rings and algebras
Measurable function	Concept	Measure and integration