Every idea

Ideas 11401–11550 of 11985.

Name	Kind	Subject
Confluent hypergeometric function	Definition	Special functions
Finite-dimensional distributions	Concept	Probability theory and stochastic processes
Involution	Definition	General algebraic systems
Tannery's theorem	Theorem	Sequences, series, summability
Connected sum	Concept	Manifolds and cell complexes
Simple random sample	Concept	Statistics
Toric ideal	Definition	Commutative algebra
Invertible operator	Definition	Operator theory
Percolation threshold	Definition	Probability theory and stochastic processes
Primitive permutation group	Concept	Group theory and generalizations
Robin boundary condition	Definition	Ordinary differential equations
Falling and rising factorials	Concept	Combinatorics
Carleson–Sjölin theorem	Theorem	Harmonic analysis on Euclidean spaces
Monotone operator	Concept	Operator theory
Vlasov equation	Definition	Partial differential equations
Hahn polynomials	Concept	Special functions
Pseudoanalytic function	Concept	Functions of a complex variable
Priority method	Definition	Mathematical logic and foundations
Group ring	Definition	Associative rings and algebras
Full subcategory	Definition	Category theory; homological algebra
q-Pochhammer symbol	Concept	Combinatorics
Universal cover	Concept	Manifolds and cell complexes
Mal'cev term	Concept	General algebraic systems
Orders of the elements of S3	Example	Group theory and generalizations
Algebraic K-theory of schemes	Concept	K-theory
Covering space	Definition	Manifolds and cell complexes
Singer's theorem	Theorem	Dynamical systems and ergodic theory
Borg–Marchenko uniqueness theorem	Theorem	Ordinary differential equations
Monomorphism	Concept	Category theory; homological algebra
Homotopy principle	Concept	Global analysis, analysis on manifolds
Iwasawa theory	Concept	Number theory
Finitely presented algebra	Definition	Commutative algebra
Enriques surface	Concept	Algebraic geometry
Curvature form	Definition	Differential geometry
Henstock–Kurzweil integral	Definition	Real functions
Rao–Blackwell theorem	Theorem	Statistics
Fisher–Tippett–Gnedenko theorem	Theorem	Probability theory and stochastic processes
Evolute	Concept	Differential geometry
Fox H-function	Definition	Special functions
Serre's finiteness theorem	Theorem	Algebraic topology
Kolmogorov–Sinai entropy	Definition	Dynamical systems and ergodic theory
Gauss multiplication formula	Theorem	Special functions
Class	Concept	Mathematical logic and foundations
Kirchberger's theorem	Theorem	Convex and discrete geometry
Multialgebra	Definition	General algebraic systems
Sauer–Shelah lemma	Lemma	Combinatorics
Non-atomic measure	Definition	Measure and integration
Sorgenfrey line	Counterexample	General topology
Intersection body	Concept	Convex and discrete geometry
Eigenvalue perturbation	Definition	Linear and multilinear algebra; matrix theory
Associative quotient of a magma	Definition	Group theory and generalizations
Schur–Horn theorem	Theorem	Linear and multilinear algebra; matrix theory
Galerkin method	Concept	Numerical analysis
Mal'cev term	Definition	General algebraic systems
Score test	Concept	Statistics
Semi-continuity	Definition	Real functions
Generic flatness	Theorem	Algebraic geometry
Completion of a topological group	Definition	Topological groups, Lie groups
Structure	Definition	Mathematical logic and foundations
Divisor class group	Definition	Commutative algebra
Sine and cosine series	Concept	Harmonic analysis on Euclidean spaces
Injectivity radius	Concept	Differential geometry
Glimm scheme	Concept	Partial differential equations
Numerical range	Definition	Operator theory
Castelnuovo–Mumford regularity	Concept	Commutative algebra
Hurewicz fibration	Concept	Algebraic topology
Universal coalgebra	Definition	General algebraic systems
de Branges space	Definition	Functional analysis
Lagrange polynomial	Concept	Approximations and expansions
Complex torus	Concept	Algebraic geometry
Canonical height	Definition	Dynamical systems and ergodic theory
Cheeger constant	Concept	Combinatorics
Hypergeometric differential equation	Definition	Special functions
Exponential map	Concept	Differential geometry
Brauer–Manin obstruction	Definition	Algebraic geometry
Prime knot	Definition	Manifolds and cell complexes
Infinite compositions of functions	Definition	Sequences, series, summability
Second-order arithmetic	Definition	Mathematical logic and foundations
Hodge structure	Definition	Algebraic geometry
Hazard function	Concept	Statistics
Continuous and residual spectrum	Definition	Operator theory
Measure with density	Concept	Measure and integration
Germ	Definition	General topology
Stochastic differential equation	Definition	Probability theory and stochastic processes
Abelian category	Concept	Category theory; homological algebra
Girard's theorem	Theorem	Geometry
Affine variety	Definition	Algebraic geometry
Permutation test	Definition	Statistics
Rigid analytic space	Concept	Algebraic geometry
Minkowski–Hlawka theorem	Theorem	Number theory
Branched covering	Concept	Manifolds and cell complexes
Dirichlet eigenvalue	Definition	Partial differential equations
Lattice of subvarieties	Definition	General algebraic systems
Euler's continued fraction formula	Theorem	Sequences, series, summability
Fractional ideal	Concept	Commutative algebra
Ree groups	Object	Group theory and generalizations
Hellinger distance	Definition	Statistics
Sz.-Nagy's dilation theorem	Theorem	Operator theory
Incomplete gamma function	Concept	Special functions
Grushko theorem	Theorem	Group theory and generalizations
Fisher's exact test	Definition	Statistics
Voter model	Example	Probability theory and stochastic processes
Thurston norm	Definition	Manifolds and cell complexes
Böttcher's equation	Theorem	Dynamical systems and ergodic theory
Kadomtsev–Petviashvili equation	Definition	Partial differential equations
Sharkovskii's theorem	Theorem	Dynamical systems and ergodic theory
Schottky group	Concept	Functions of a complex variable
Order filter	Definition	Order, lattices, ordered algebraic structures
Zariski's lemma	Lemma	Commutative algebra
Balinski's theorem	Theorem	Convex and discrete geometry
q-gamma function	Definition	Special functions
Approximation by convolution with mollifiers	Theorem	Functional analysis
Buchberger's algorithm	Definition	Commutative algebra
Evolute	Definition	Differential geometry
Hessenberg matrix	Concept	Linear and multilinear algebra; matrix theory
Boundary layer	Concept	Ordinary differential equations
Homology with coefficients	Definition	Algebraic topology
Autocorrelation function	Concept	Statistics
Homotopy groups of spheres	Concept	Algebraic topology
Dini derivative	Definition	Real functions
Barnes G-function	Definition	Special functions
Artin–Schreier theorem on formally real fields	Theorem	Field theory and polynomials
Amitsur–Levitzki theorem	Theorem	Associative rings and algebras
Brjuno number	Definition	Dynamical systems and ergodic theory
Successive minima	Concept	Number theory
Frequentist inference	Concept	Statistics
Going-down theorem	Theorem	Commutative algebra
Mazur–Orlicz theorem	Theorem	Sequences, series, summability
Stationary set	Concept	Mathematical logic and foundations
Hill differential equation	Example	Ordinary differential equations
Bieberbach theorems	Theorem	Group theory and generalizations
Sturm separation theorem	Theorem	Ordinary differential equations
Random dynamical system	Definition	Dynamical systems and ergodic theory
Nagata's example of a Noetherian ring of infinite dimension	Counterexample	Commutative algebra
von Neumann bounded set	Definition	Functional analysis
Schläfli symbol	Definition	Geometry
HNN extension	Concept	Group theory and generalizations
Quasi-analytic function	Concept	Real functions
Unirational variety	Concept	Algebraic geometry
Limit set	Concept	Dynamical systems and ergodic theory
Excellent ring	Concept	Commutative algebra
Zero morphism	Concept	Category theory; homological algebra
Generalized cohomology theory	Definition	Algebraic topology
Isomorphism theorem for measure algebras	Theorem	Measure and integration
Hilbert's Theorem 90	Theorem	Field theory and polynomials
Order of a PDE	Definition	Partial differential equations
Malcev completion	Definition	Topological groups, Lie groups
Birkhoff–Frink representation of algebraic closure systems	Theorem	General algebraic systems
(∞,1)-category	Concept	Category theory; homological algebra
Uniform boundedness principle	Theorem	Functional analysis