Concepts

A mathematical idea. It can have more than one definition.

Ideas 2101–2250 of 5206.

Name	Kind	Subject
Regularity of minimizers	Concept	Calculus of variations and optimal control; optimization
Separably closed field	Concept	Field theory and polynomials
Wishart distribution	Concept	Statistics
Bar resolution	Concept	Group theory and generalizations
Epigraph	Concept	Convex and discrete geometry
Steiner symmetrization	Concept	Convex and discrete geometry
Kantorovich polynomials	Concept	Approximations and expansions
Modality of a singularity	Concept	Global analysis, analysis on manifolds
Approximation property	Concept	Functional analysis
Borel summation	Concept	Sequences, series, summability
Projective hierarchy	Concept	Mathematical logic and foundations
Forward difference operator	Concept	Difference and functional equations
Principal bundle	Concept	Algebraic topology
Minimax estimator	Concept	Statistics
Painlevé property	Concept	Ordinary differential equations
Frobenius algebra	Concept	Associative rings and algebras
Primitive ring	Concept	Associative rings and algebras
WZ theory	Concept	Combinatorics
Anosov flow	Concept	Dynamical systems and ergodic theory
Logarithmically convex function	Concept	Real functions
Commuting matrices	Concept	Linear and multilinear algebra; matrix theory
Rational homotopy theory	Concept	Algebraic topology
Empirical Bayes method	Concept	Statistics
Gabor transform	Concept	Harmonic analysis on Euclidean spaces
Bonferroni correction	Concept	Statistics
Haefliger structure	Concept	Manifolds and cell complexes
Directional statistics	Concept	Statistics
Lévy–Prokhorov metric	Concept	Probability theory and stochastic processes
4-manifold	Concept	Manifolds and cell complexes
BK-space	Concept	Functional analysis
Associated graded ring	Concept	Commutative algebra
Crossed product	Concept	Functional analysis
Almost convergence	Concept	Sequences, series, summability
Fredholm operator	Concept	Operator theory
Multivariate analysis of variance	Concept	Statistics
Minimum description length	Concept	Statistics
Orthocentric system	Concept	Geometry
Graded ring	Concept	Commutative algebra
Symplectic capacity	Concept	Differential geometry
Matching pursuit	Concept	Approximations and expansions
Integral equation of the second kind	Concept	Integral equations
Formally smooth map	Concept	Commutative algebra
Stability of Volterra equations	Concept	Integral equations
Admissible control	Concept	Calculus of variations and optimal control; optimization
F-sigma set	Concept	General topology
Essential submodule	Concept	Associative rings and algebras
F-test	Concept	Statistics
Dirichlet series	Concept	Number theory
Homotopy group with coefficients	Concept	Algebraic topology
Lévy process	Concept	Probability theory and stochastic processes
Kolmogorov complexity	Concept	Computer science
Total variation	Concept	Real functions
Locally finite variety	Concept	General algebraic systems
Paracompact space	Concept	General topology
Conservation law	Concept	Partial differential equations
Bergman kernel	Concept	Functions of a complex variable
Zariski topology	Concept	Algebraic geometry
MV-algebra	Concept	Order, lattices, ordered algebraic structures
Birkhoff sum and average	Concept	Dynamical systems and ergodic theory
Markov chain mixing time	Concept	Probability theory and stochastic processes
Orthogonal polynomials	Concept	Harmonic analysis on Euclidean spaces
Efficiency of an estimator	Concept	Statistics
Polygon	Concept	Geometry
Polyconvexity	Concept	Calculus of variations and optimal control; optimization
Elementary substructure	Concept	Mathematical logic and foundations
Summability method	Concept	Sequences, series, summability
Homogeneous and inhomogeneous linear recurrences	Concept	Difference and functional equations
Derived set	Concept	General topology
Moishezon manifold	Concept	Several complex variables and analytic spaces
Exterior differential system	Concept	Global analysis, analysis on manifolds
Reduced function	Concept	Potential theory
Geometric optics	Concept	Optics, electromagnetic theory
Orientation of a manifold	Concept	Manifolds and cell complexes
Henselization	Concept	Commutative algebra
Stanley–Reisner ring	Concept	Commutative algebra
Supercompact cardinal	Concept	Mathematical logic and foundations
Maslov index	Concept	Differential geometry
Singular control	Concept	Calculus of variations and optimal control; optimization
Hörmander's condition	Concept	Partial differential equations
Quotient of a normed space	Concept	Functional analysis
Borel functional calculus	Concept	Operator theory
Topological group	Concept	Topological groups, Lie groups
Hyperbolic partial differential equation	Concept	Partial differential equations
Lyapunov equation	Concept	Linear and multilinear algebra; matrix theory
Multidimensional Mellin transform	Concept	Integral transforms, operational calculus
Dynkin quiver	Concept	Associative rings and algebras
Pseudo algebraically closed field	Concept	Field theory and polynomials
Theory	Concept	Mathematical logic and foundations
Quasi-category	Concept	Category theory; homological algebra
Dual Radon transform	Concept	Integral transforms, operational calculus
Nelson–Aalen estimator	Concept	Statistics
Morse homology	Concept	Manifolds and cell complexes
Quasi-identity	Concept	General algebraic systems
Weakly singular kernel	Concept	Integral equations
Weak-type estimate	Concept	Harmonic analysis on Euclidean spaces
Proper morphism	Concept	Algebraic geometry
j-invariant of an elliptic curve	Concept	Algebraic geometry
Semi-continuity	Concept	Real functions
Cauchy matrix	Concept	Linear and multilinear algebra; matrix theory
Unitary dual	Concept	Topological groups, Lie groups
Besov space	Concept	Functional analysis
System of parameters	Concept	Commutative algebra
Fiber of a morphism	Concept	Algebraic geometry
Purely inseparable extension	Concept	Field theory and polynomials
Magma	Concept	Group theory and generalizations
Lie group action	Concept	Manifolds and cell complexes
Polylogarithm	Concept	Special functions
Filtered category	Concept	Category theory; homological algebra
Čech cohomology	Concept	Algebraic topology
Comonad	Concept	Category theory; homological algebra
Sub-Riemannian manifold	Concept	Differential geometry
Exponential sum	Concept	Number theory
Structure	Concept	Mathematical logic and foundations
Majority term	Concept	General algebraic systems
Finite element method	Concept	Numerical analysis
Foliation	Concept	Manifolds and cell complexes
Rational singularity	Concept	Algebraic geometry
Weyl algebra	Concept	Associative rings and algebras
Esakia space	Concept	Order, lattices, ordered algebraic structures
Riesz space	Concept	Functional analysis
Atomistic lattice	Concept	Order, lattices, ordered algebraic structures
Superadditive function	Concept	Difference and functional equations
Hurwitz-stable matrix	Concept	Linear and multilinear algebra; matrix theory
Universal Horn class	Concept	Mathematical logic and foundations
Pettis integral	Concept	Measure and integration
Discrete series representation	Concept	Topological groups, Lie groups
Jacobi field	Concept	Differential geometry
Thurston norm	Concept	Manifolds and cell complexes
Orderable group	Concept	Group theory and generalizations
Maxwell's equations	Concept	Partial differential equations
Polish group	Concept	Topological groups, Lie groups
Subderivative	Concept	Real functions
Simple algebra	Concept	General algebraic systems
Solvable Lie group	Concept	Topological groups, Lie groups
Sequential analysis	Concept	Statistics
Dirichlet L-function	Concept	Number theory
Levitzki radical	Concept	Associative rings and algebras
Ehrhart polynomial	Concept	Convex and discrete geometry
Incidence matrix	Concept	Combinatorics
Lie supergroup	Concept	Global analysis, analysis on manifolds
Geometric invariant theory	Concept	Algebraic geometry
Cumulant	Concept	Probability theory and stochastic processes
Compact element	Concept	Order, lattices, ordered algebraic structures
Drazin inverse	Concept	Linear and multilinear algebra; matrix theory
Calabi flow	Concept	Differential geometry
Idempotence	Concept	General algebraic systems
Gelfand–Naimark–Segal construction	Concept	Functional analysis
Monoid object	Concept	Category theory; homological algebra
Laplace's method	Concept	Approximations and expansions
Loewner order	Concept	Linear and multilinear algebra; matrix theory