Every idea

Ideas 11251–11400 of 14183.

Name	Kind	Subject
Coarea formula	Theorem	Measure and integration
Spectral geometry	Concept	Global analysis, analysis on manifolds
Whitehead product	Concept	Algebraic topology
Fully invariant congruence	Concept	General algebraic systems
Cardinal function	Definition	General topology
Model category	Definition	Category theory; homological algebra
Lagrangian singularity	Concept	Differential geometry
Bidual and canonical embedding	Concept	Functional analysis
Prime ideal of a lattice	Concept	Order, lattices, ordered algebraic structures
Fermat point	Concept	Geometry
Ky Fan minimax inequality	Theorem	Calculus of variations and optimal control; optimization
Finite type algebra	Definition	Commutative algebra
Weyl integration formula	Theorem	Topological groups, Lie groups
Graphon	Concept	Combinatorics
Mather–Yau theorem	Theorem	Several complex variables and analytic spaces
Box spline	Concept	Approximations and expansions
Dirac operator on a spin manifold	Concept	Differential geometry
Abel transform	Concept	Integral transforms, operational calculus
Laurent polynomial ring	Concept	Associative rings and algebras
Identity component	Definition	Topological groups, Lie groups
Moore–Osgood theorem	Theorem	Sequences, series, summability
Satisfiability	Concept	Mathematical logic and foundations
Logistic map	Example	Dynamical systems and ergodic theory
Whipple's transformation	Theorem	Special functions
Prolate spheroidal wave functions	Concept	Special functions
Sufficient statistic	Definition	Statistics
Fox H-function transforms	Definition	Integral transforms, operational calculus
Pseudofunctor	Definition	Category theory; homological algebra
Cauchy–Riemann equations in several variables	Definition	Several complex variables and analytic spaces
Congruence generated by a relation	Concept	General algebraic systems
Symplectomorphism	Definition	Differential geometry
Polytope	Concept	Convex and discrete geometry
Cartan's magic formula	Proposition	Global analysis, analysis on manifolds
Deformation of algebras	Concept	Associative rings and algebras
Total curvature	Concept	Differential geometry
Bargmann transform	Concept	Integral transforms, operational calculus
Interval arithmetic	Concept	Numerical analysis
Hilbert's nineteenth problem	Problem	Partial differential equations
Cartan connection	Concept	Differential geometry
Space-filling curve	Example	General topology
Dynamic programming in continuous time	Concept	Calculus of variations and optimal control; optimization
Abstract data type as an algebra	Definition	Computer science
Gentzen's consistency proof	Theorem	Mathematical logic and foundations
Method of matched asymptotic expansions	Concept	Ordinary differential equations
Mesh generation	Definition	Numerical analysis
Differential operator between vector bundles	Definition	Global analysis, analysis on manifolds
Boundary integral method for the Dirichlet problem	Concept	Potential theory
Funk transform	Definition	Integral transforms, operational calculus
Vojta's conjecture	Conjecture	Number theory
Fano plane	Object	Geometry
Lie group method for PDEs	Concept	Partial differential equations
Heaviside operational calculus	Concept	Integral transforms, operational calculus
Schreier refinement theorem	Theorem	Group theory and generalizations
Discrete subgroup	Definition	Topological groups, Lie groups
Nilradical	Concept	Commutative algebra
Alexander horned sphere	Counterexample	Manifolds and cell complexes
Variation of parameters for difference equations	Theorem	Difference and functional equations
Counting measure	Example	Measure and integration
Saddle point of a Lagrangian	Definition	Operations research, mathematical programming
Wigner D-matrix	Concept	Special functions
Topological manifold	Concept	Manifolds and cell complexes
Haefliger structure	Definition	Manifolds and cell complexes
Dunford–Pettis property	Concept	Functional analysis
Absolutely monotonic function	Concept	Real functions
Triangulation	Definition	Manifolds and cell complexes
Condition number	Definition	Linear and multilinear algebra; matrix theory
Lehmann–Scheffé theorem	Theorem	Statistics
Gaussian process	Definition	Probability theory and stochastic processes
Horn clause	Concept	Mathematical logic and foundations
Uniformly most powerful test	Concept	Statistics
Tamari lattice	Example	Order, lattices, ordered algebraic structures
Lyapunov exponent	Definition	Ordinary differential equations
Fractional differential equation	Definition	Ordinary differential equations
Logical connective	Concept	Mathematical logic and foundations
Haken manifold	Definition	Manifolds and cell complexes
Jordan curve theorem for polygons	Theorem	Geometry
Packing measure	Definition	Measure and integration
Singular values of a compact operator	Concept	Operator theory
Lenagan's theorem	Theorem	Associative rings and algebras
The symmetric group S3 is not abelian	Example	Group theory and generalizations
Join	Definition	General topology
Mandelbrot set	Object	Dynamical systems and ergodic theory
Valuation ring	Concept	Commutative algebra
Pincherle derivative	Definition	Operator theory
Multidimensional Laplace transform	Concept	Integral transforms, operational calculus
Shimura variety	Concept	Algebraic geometry
Seifert surface	Definition	Manifolds and cell complexes
Categorical theory	Definition	Mathematical logic and foundations
Birkhoff min-max method	Definition	Global analysis, analysis on manifolds
Survival function	Concept	Statistics
Fixed-point property of posets	Definition	Order, lattices, ordered algebraic structures
Natural boundary condition	Concept	Calculus of variations and optimal control; optimization
John–Nirenberg inequality	Theorem	Harmonic analysis on Euclidean spaces
Basis of a matroid	Concept	Combinatorics
Lattice of equational theories	Definition	General algebraic systems
Pontryagin duality theorem	Theorem	Abstract harmonic analysis
Iterative refinement	Proposition	Numerical analysis
Removable sets for bounded harmonic functions	Theorem	Potential theory
Perspectivity	Concept	Geometry
Idempotence	Definition	General algebraic systems
Cheeger–Gromoll splitting theorem	Theorem	Differential geometry
Lebesgue–Stieltjes measure	Concept	Measure and integration
Continuous q-Hermite polynomials	Definition	Special functions
Mahler measure	Concept	Number theory
Hypersingular integral equation	Concept	Integral equations
MV-algebra	Definition	Order, lattices, ordered algebraic structures
Galois representation	Definition	Number theory
Lawson topology	Definition	Order, lattices, ordered algebraic structures
Domain of finite type	Definition	Several complex variables and analytic spaces
Sanov's theorem	Theorem	Probability theory and stochastic processes
Cayley–Abels graph	Concept	Topological groups, Lie groups
Lorentz group	Example	Topological groups, Lie groups
Exponential functions on semigroups	Concept	Difference and functional equations
Nonemptiness of the spectrum	Theorem	Functional analysis
Quasi-primal algebra	Concept	General algebraic systems
Normal family	Definition	Functions of a complex variable
Addition formulas for Jacobi elliptic functions	Theorem	Special functions
Solvability of x^n - a	Proposition	Field theory and polynomials
Frankel conjecture	Theorem	Several complex variables and analytic spaces
Numerical stability	Definition	Numerical analysis
Modular lattice	Concept	Order, lattices, ordered algebraic structures
Topological semigroup	Concept	Topological groups, Lie groups
Missing data mechanisms	Definition	Statistics
Determinacy	Concept	Mathematical logic and foundations
Holomorphically convex hull	Definition	Several complex variables and analytic spaces
Castelnuovo's rationality criterion	Theorem	Algebraic geometry
Conservative system	Definition	Dynamical systems and ergodic theory
Convolution theorem	Theorem	Harmonic analysis on Euclidean spaces
Open subgroup	Concept	Topological groups, Lie groups
Wild knot	Counterexample	Manifolds and cell complexes
Knot	Concept	Manifolds and cell complexes
Herman ring	Definition	Dynamical systems and ergodic theory
Struve function	Definition	Special functions
Feichtinger conjecture	Theorem	Harmonic analysis on Euclidean spaces
Pringsheim convergence	Concept	Sequences, series, summability
Cartan's classification of bounded symmetric domains	Theorem	Several complex variables and analytic spaces
Tate's thesis	Concept	Number theory
Tits alternative	Theorem	Group theory and generalizations
Wiener–Hopf equation	Concept	Integral equations
Incomplete Cholesky factorization	Concept	Numerical analysis
Spin structure	Definition	Differential geometry
Spectral space	Definition	General topology
Locally presentable category	Definition	Category theory; homological algebra
Wynn's epsilon algorithm	Definition	Numerical analysis
Cohomological dimension of a field	Concept	Field theory and polynomials
Valuative criterion	Theorem	Algebraic geometry
Hilbert's syzygy theorem	Theorem	Commutative algebra
Pincherle derivative	Concept	Operator theory
Ising model	Example	Statistical mechanics, structure of matter
Kuranishi family	Concept	Several complex variables and analytic spaces