Every idea

Ideas 3601–3750 of 14183.

Name	Kind	Subject
Enriques–Kodaira classification	Theorem	Algebraic geometry
Model theory	Definition	Mathematical logic and foundations
Non-Archimedean absolute value	Concept	Field theory and polynomials
Algebraic approach to constraint satisfaction	Definition	General algebraic systems
Congruence subgroup	Concept	Number theory
Permutation pattern	Concept	Combinatorics
Support function	Concept	Convex and discrete geometry
Incidence algebra	Concept	Order, lattices, ordered algebraic structures
Regular local rings are UFDs	Theorem	Commutative algebra
Universal bundle	Concept	Algebraic topology
Boundary value problem	Definition	Ordinary differential equations
Hyperstructure	Concept	Group theory and generalizations
Logical consequence	Concept	Mathematical logic and foundations
Monoid ring	Concept	Associative rings and algebras
Telegrapher's equations	Concept	Partial differential equations
Octonions	Object	Nonassociative rings and algebras
Random matrix	Concept	Linear and multilinear algebra; matrix theory
Evans's theorem on word problems	Theorem	General algebraic systems
Giroux correspondence	Theorem	Manifolds and cell complexes
Twelvefold way	Concept	Combinatorics
Feedback linearization	Concept	Systems theory; control
Positive-definite function on a group	Definition	Abstract harmonic analysis
Mayer and Lagrange problems	Problem	Calculus of variations and optimal control; optimization
Fundamental strip of a Mellin transform	Proposition	Integral transforms, operational calculus
Semifield	Definition	Field theory and polynomials
Arithmetical variety	Definition	General algebraic systems
Cramér–Rao bound	Theorem	Statistics
Singularity of a smooth map	Concept	Global analysis, analysis on manifolds
Categorical theory	Concept	Mathematical logic and foundations
Elliptic cohomology	Definition	Algebraic topology
Collectively compact operator approximation	Definition	Integral equations
Hopf bifurcation	Definition	Ordinary differential equations
Unramified morphism	Concept	Algebraic geometry
Non-negative least squares	Problem	Numerical analysis
Fourier transform on Schwartz space	Theorem	Harmonic analysis on Euclidean spaces
Handle decomposition	Definition	Manifolds and cell complexes
Sheffer function	Concept	General algebraic systems
Transcritical bifurcation	Definition	Ordinary differential equations
Kuranishi structure	Definition	Differential geometry
Proximity space	Definition	General topology
Cylindric algebra	Concept	Mathematical logic and foundations
Free Boolean algebra	Concept	Order, lattices, ordered algebraic structures
Hilbert system	Concept	Mathematical logic and foundations
Serre subcategory	Definition	Category theory; homological algebra
Bernstein–Bézier form	Definition	Approximations and expansions
Airy function	Concept	Special functions
Abstract Volterra equation	Concept	Integral equations
Finite morphism of rings	Concept	Commutative algebra
Base change theorems	Theorem	Algebraic geometry
Homotopy limit	Concept	Category theory; homological algebra
Poincaré's theorem that the ball and polydisc are not biholomorphic	Theorem	Several complex variables and analytic spaces
Prenex normal form	Definition	Mathematical logic and foundations
Compactness theorem	Theorem	Mathematical logic and foundations
Radon–Nikodym derivative	Concept	Measure and integration
Initial topology	Concept	General topology
Semisimple Lie group	Definition	Topological groups, Lie groups
Levin-type transformations	Concept	Numerical analysis
Comparability graph	Concept	Combinatorics
Inversion of rational transforms by partial fractions	Concept	Integral transforms, operational calculus
Linearly ordered group	Definition	Order, lattices, ordered algebraic structures
Stone–Weierstrass theorem	Theorem	Functional analysis
Region of convergence	Concept	Integral transforms, operational calculus
Pettis measurability theorem	Theorem	Measure and integration
Solenoid	Example	Topological groups, Lie groups
Barnes integral	Concept	Special functions
Birkhoff–Grothendieck theorem	Theorem	Algebraic geometry
Mahler measure	Definition	Number theory
Efficiency of an estimator	Definition	Statistics
Non-measurable set	Definition	Measure and integration
Proof complexity	Concept	Mathematical logic and foundations
Krull intersection theorem	Theorem	Commutative algebra
Topological dynamics	Definition	Dynamical systems and ergodic theory
Summability kernel	Concept	Harmonic analysis on Euclidean spaces
Finite difference method	Definition	Numerical analysis
Jet	Concept	Global analysis, analysis on manifolds
Dual graph	Concept	Combinatorics
Direct limit of rings	Definition	Associative rings and algebras
Rubin causal model	Definition	Statistics
Non-standard model of arithmetic	Example	Mathematical logic and foundations
Log-rank test	Definition	Statistics
Laurent polynomial ring	Definition	Associative rings and algebras
Birkhoff min-max method	Concept	Global analysis, analysis on manifolds
Riemannian metric	Definition	Differential geometry
Flux limiter	Definition	Numerical analysis
Weakly compact cardinal	Concept	Mathematical logic and foundations
Associated prime	Definition	Commutative algebra
Szegő recurrence and Verblunsky coefficients	Theorem	Harmonic analysis on Euclidean spaces
Post's problem	Problem	Mathematical logic and foundations
Symmetric spectrum	Concept	Algebraic topology
Structural rigidity	Definition	Convex and discrete geometry
Arakelyan's theorem	Theorem	Functions of a complex variable
t-structure	Definition	Category theory; homological algebra
Scott domain	Concept	Order, lattices, ordered algebraic structures
Robinson–Schensted correspondence	Theorem	Combinatorics
Cap set problem	Theorem	Combinatorics
Huygens principle	Theorem	Partial differential equations
Locally path-connected space	Definition	General topology
Kirkman's schoolgirl problem	Problem	Combinatorics
Derivation of the conjugate gradient method	Proposition	Numerical analysis
Functional	Definition	Calculus of variations and optimal control; optimization
Affine morphism	Definition	Algebraic geometry
Slice category	Concept	Category theory; homological algebra
Zeros and poles	Concept	Functions of a complex variable
Fock space	Object	Functional analysis
Rossi's non-embeddable CR structure	Counterexample	Several complex variables and analytic spaces
Hochster's homological conjectures	Conjecture	Commutative algebra
Unknot	Example	Manifolds and cell complexes
Midpoint convex function	Concept	Real functions
Minkowski bound	Theorem	Number theory
Associative algebra	Definition	Associative rings and algebras
Clarkson's inequalities	Theorem	Functional analysis
Riesz potential	Concept	Potential theory
Quantum enveloping algebra	Concept	Nonassociative rings and algebras
Minimal clone	Concept	General algebraic systems
Functional data analysis	Definition	Statistics
Commutant	Concept	Functional analysis
Brouwer–Heyting–Kolmogorov interpretation	Definition	Mathematical logic and foundations
Conformal invariance of harmonic functions	Proposition	Potential theory
Space form	Concept	Differential geometry
Representation theory of the symmetric group	Concept	Group theory and generalizations
Holmgren's uniqueness theorem	Theorem	Partial differential equations
CUSUM	Concept	Statistics
Dynamic equation on time scales	Definition	Ordinary differential equations
Beltrami–Klein model	Example	Geometry
Queueing theory	Definition	Probability theory and stochastic processes
Pseudo-element	Concept	Category theory; homological algebra
Cuthill–McKee algorithm	Proposition	Numerical analysis
Functor category	Concept	Category theory; homological algebra
Quasi-everywhere	Concept	Potential theory
Jacobson ring	Definition	Commutative algebra
Kobayashi conjecture	Conjecture	Several complex variables and analytic spaces
Sectional curvature	Concept	Differential geometry
Balayage	Definition	Potential theory
Koszul complex	Definition	Commutative algebra
Cartan–Thullen theorem	Theorem	Several complex variables and analytic spaces
Degree of a projective variety	Concept	Algebraic geometry
Weak ordering	Definition	Order, lattices, ordered algebraic structures
Riemann zeta function	Concept	Number theory
Algebraic set	Definition	Algebraic geometry
O-minimal theory	Definition	Mathematical logic and foundations
Saccheri–Legendre theorem	Theorem	Geometry
Poisson regression	Definition	Statistics
Lebesgue's theorem on differentiability of monotone functions	Theorem	Real functions
Hodge star operator	Concept	Global analysis, analysis on manifolds
Analytic torsion	Definition	Global analysis, analysis on manifolds
Loewner's torus inequality	Theorem	Differential geometry
Favard's theorem	Theorem	Harmonic analysis on Euclidean spaces
Newton–Kantorovich theorem	Theorem	Numerical analysis
Local index theorem	Theorem	Global analysis, analysis on manifolds
Lickorish–Wallace theorem	Theorem	Manifolds and cell complexes