Every idea

Ideas 13351–13500 of 14167.

Name	Kind	Subject
Unimodular group	Definition	Topological groups, Lie groups
Contraction semigroup	Concept	Operator theory
Fredholm's theorem	Theorem	Integral equations
Hyperbolic partial differential equation	Definition	Partial differential equations
Intuitionism	Concept	Mathematical logic and foundations
Hochschild homology	Definition	Associative rings and algebras
Goodstein's theorem	Theorem	Mathematical logic and foundations
Pseudo-differential operator	Definition	Partial differential equations
Montessus de Ballore's theorem	Theorem	Approximations and expansions
Laplace transform method for convolution equations	Definition	Integral equations
Ideal completion	Definition	Order, lattices, ordered algebraic structures
Hodge index theorem	Theorem	Algebraic geometry
Finiteness of associated primes	Theorem	Commutative algebra
Pseudovariety	Concept	General algebraic systems
Schwarz reflection principle for harmonic functions	Theorem	Potential theory
Graph reconstruction conjecture	Conjecture	Combinatorics
Descending chain condition	Definition	Order, lattices, ordered algebraic structures
Method of fundamental solutions	Definition	Numerical analysis
Separable degree	Definition	Field theory and polynomials
Cyclic term theorem	Theorem	General algebraic systems
Shilov boundary	Definition	Functional analysis
Hotelling's T-squared distribution	Concept	Statistics
Amalgamation property	Concept	Mathematical logic and foundations
Low-discrepancy sequence	Concept	Number theory
Green's function of a Markov process	Concept	Probability theory and stochastic processes
Manin conjecture	Conjecture	Algebraic geometry
System of parameters	Definition	Commutative algebra
Hadamard's lemma	Lemma	Real functions
Heilbronn triangle problem	Problem	Convex and discrete geometry
Dirichlet process	Concept	Probability theory and stochastic processes
Jordan–Schur theorem	Theorem	Group theory and generalizations
Homology with coefficients	Concept	Algebraic topology
Weyl–Titchmarsh theory	Concept	Ordinary differential equations
Rational variety	Concept	Algebraic geometry
Conformal geometric algebra	Definition	Linear and multilinear algebra; matrix theory
Lebesgue integral	Definition	Measure and integration
Well-powered category	Concept	Category theory; homological algebra
Kruskal's tree theorem	Theorem	Combinatorics
Gromov–Witten invariant	Concept	Algebraic geometry
Blaschke–Lebesgue theorem	Theorem	Convex and discrete geometry
Cardinal function	Concept	General topology
Semiprimary ring	Concept	Associative rings and algebras
Supporting hyperplane	Definition	Convex and discrete geometry
Disk algebra	Definition	Functional analysis
Bombieri–De Giorgi–Giusti theorem	Theorem	Calculus of variations and optimal control; optimization
Balian–Low theorem	Theorem	Harmonic analysis on Euclidean spaces
Schramm–Loewner evolution	Definition	Probability theory and stochastic processes
Conformal geometry	Definition	Differential geometry
Étale morphism	Definition	Algebraic geometry
Burnside problem	Problem	Group theory and generalizations
Three-term recurrence relation	Definition	Difference and functional equations
Dynamical billiards	Concept	Dynamical systems and ergodic theory
Landau's necessary density conditions for sampling	Theorem	Information and communication theory, circuits
Numerical range	Concept	Operator theory
Poncelet's closure theorem	Theorem	Geometry
Enriched category	Definition	Category theory; homological algebra
Kontsevich formality theorem	Theorem	Differential geometry
Degree of exactness of a quadrature rule	Definition	Numerical analysis
Factorization of polynomials over finite fields	Definition	Number theory
Delta derivative on a time scale	Concept	Real functions
Spectrum of an operator	Definition	Operator theory
Tilting theory	Concept	Associative rings and algebras
Knot concordance	Definition	Manifolds and cell complexes
Volterra equation of the second kind	Definition	Integral equations
Automorphism	Definition	General algebraic systems
Cospherical points	Definition	Geometry
Symmetric kernel	Definition	Integral equations
Bôcher's theorem	Theorem	Potential theory
Elliptic operator	Concept	Operator theory
Classification of regular polytopes	Theorem	Geometry
Day convolution	Definition	Category theory; homological algebra
Umbilical point	Concept	Differential geometry
Almost periodic function	Definition	Abstract harmonic analysis
Sequence space	Concept	Functional analysis
List of small groups	Example	Group theory and generalizations
Conservation law	Definition	Partial differential equations
Skeleton of a category	Definition	Category theory; homological algebra
Generalized mean inequality	Theorem	Real functions
Radial basis function interpolation	Concept	Numerical analysis
Fermat point	Definition	Geometry
Morphism	Definition	Category theory; homological algebra
Toric ideal	Concept	Commutative algebra
Erdős–Stone theorem	Theorem	Combinatorics
Fenchel–Moreau theorem	Theorem	Convex and discrete geometry
Homotopy equivalence	Concept	Algebraic topology
Kummer theory	Concept	Number theory
Tight closure	Definition	Commutative algebra
Mathematical statistics	Concept	Statistics
Primitive recursive function	Definition	Mathematical logic and foundations
Functional equations on groups	Definition	Difference and functional equations
Hardy space	Definition	Functions of a complex variable
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
Poisson–Mellin–Newton cycle	Concept	Integral transforms, operational calculus
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
Rayleigh quotient iteration	Theorem	Numerical analysis
Robin boundary condition	Definition	Ordinary differential equations
Falling and rising factorials	Concept	Combinatorics
Carleson–Sjölin theorem	Theorem	Harmonic analysis on Euclidean spaces
Liouville property of graphs	Concept	Potential theory
Symmetric successive over-relaxation	Theorem	Numerical analysis
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
Szegő kernel	Concept	Several complex variables and analytic spaces
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
Laguerre's method	Theorem	Numerical analysis
Covering space	Definition	Manifolds and cell complexes
Singer's theorem	Theorem	Dynamical systems and ergodic theory
Borg–Marchenko uniqueness theorem	Theorem	Ordinary differential equations
Newton series	Concept	Difference and functional 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
Dolbeault cohomology	Concept	Several complex variables and analytic spaces
Henstock–Kurzweil integral	Definition	Real functions
Rao–Blackwell theorem	Theorem	Statistics
Box spline	Definition	Approximations and expansions
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
Class VII surface	Concept	Several complex variables and analytic spaces
Sorgenfrey line	Counterexample	General topology
Riccati differential equation of optimal control	Concept	Calculus of variations and optimal control; optimization