Every idea

Ideas 11851–12000 of 14183.

Name	Kind	Subject
F-space	Definition	Functional analysis
Supercompact cardinal	Definition	Mathematical logic and foundations
Ladyzhenskaya–Babuška–Brezzi condition	Theorem	Numerical analysis
Extremal graph theory	Concept	Combinatorics
Preadditive category	Concept	Category theory; homological algebra
Periodic boundary conditions	Definition	Ordinary differential equations
Elliptic operator	Definition	Operator theory
Accessible category	Definition	Category theory; homological algebra
Embedding of structures	Concept	General algebraic systems
Design of experiments	Definition	Statistics
Universal enveloping algebra	Concept	Nonassociative rings and algebras
Homogeneous polynomial	Definition	Commutative algebra
Maximum and minimum	Definition	Real functions
Fourier multiplier	Definition	Harmonic analysis on Euclidean spaces
Weierstrass polynomial	Concept	Several complex variables and analytic spaces
Spherical code	Concept	Convex and discrete geometry
Shoelace formula	Theorem	Geometry
Tensor product of fields	Definition	Field theory and polynomials
Identity component	Concept	Topological groups, Lie groups
Hilbert's eighteenth problem	Problem	Convex and discrete geometry
Model category	Concept	Category theory; homological algebra
Shafarevich's theorem on solvable Galois groups	Theorem	Field theory and polynomials
Prolate spheroidal wave functions	Definition	Special functions
Weyl's unitary trick	Definition	Topological groups, Lie groups
Adele ring	Concept	Number theory
Loop-erased random walk	Definition	Probability theory and stochastic processes
Puiseux series	Concept	Commutative algebra
Krein space	Definition	Functional analysis
Scorer's function	Definition	Special functions
Hölder's theorem	Theorem	Special functions
Block system	Concept	Group theory and generalizations
Transform pair	Definition	Integral transforms, operational calculus
Linking number	Concept	Manifolds and cell complexes
Relaxed control	Concept	Calculus of variations and optimal control; optimization
Hilbertian field	Concept	Field theory and polynomials
Energy of a measure	Concept	Potential theory
Quasi-arithmetic mean	Concept	Real functions
Fourier coefficient	Definition	Harmonic analysis on Euclidean spaces
Ore localization	Concept	Associative rings and algebras
Free loop space	Object	Global analysis, analysis on manifolds
Delaunay triangulation	Definition	Convex and discrete geometry
Excision theorem	Theorem	Algebraic topology
Duffing equation	Example	Ordinary differential equations
Completely monotone function	Definition	Real functions
Walsh function	Definition	Harmonic analysis on Euclidean spaces
Mellin convergence	Concept	Integral transforms, operational calculus
Cayley–Hamilton theorem for modules	Proposition	Commutative algebra
Green's function	Concept	Ordinary differential equations
Singular homology	Definition	Algebraic topology
Relaxed control	Definition	Calculus of variations and optimal control; optimization
24-cell	Object	Geometry
Local class field theory	Concept	Number theory
Order of an entire function	Concept	Functions of a complex variable
Siegel zero	Definition	Number theory
Gumm terms	Concept	General algebraic systems
Chain homotopy	Definition	Category theory; homological algebra
Julia set	Definition	Dynamical systems and ergodic theory
Linearity of the Laplace transform	Proposition	Integral transforms, operational calculus
Elliptic curve	Definition	Algebraic geometry
Homology sphere	Definition	Manifolds and cell complexes
f-vector	Definition	Convex and discrete geometry
Vlasov equation	Concept	Partial differential equations
Hamilton–Jacobi–Bellman equation	Concept	Calculus of variations and optimal control; optimization
Filtered back-projection	Concept	Integral transforms, operational calculus
d'Alembert's functional equation	Definition	Difference and functional equations
Krull's principal ideal theorem	Theorem	Commutative algebra
Weak solution	Concept	Partial differential equations
Homotopy type	Concept	Algebraic topology
Monodromy	Definition	Ordinary differential equations
Tracy–Widom distribution	Definition	Probability theory and stochastic processes
Peak function	Concept	Several complex variables and analytic spaces
Martin boundary	Definition	Potential theory
Unilateral Z-transform	Definition	Integral transforms, operational calculus
Euler–Gauss limit formula	Theorem	Special functions
Hypoelliptic operator	Definition	Partial differential equations
Lefschetz principle	Theorem	Mathematical logic and foundations
Hellinger distance	Concept	Statistics
Golay code	Object	Information and communication theory, circuits
Hom functor	Definition	Category theory; homological algebra
Siciak extremal function	Definition	Several complex variables and analytic spaces
Indefinite sum	Concept	Difference and functional equations
Group algebra	Definition	Group theory and generalizations
Null-homotopic map	Concept	Algebraic topology
Tensor product of modules	Definition	Commutative algebra
Comparability graph	Definition	Combinatorics
Grothendieck universe	Concept	Mathematical logic and foundations
Tensor rank	Definition	Linear and multilinear algebra; matrix theory
Left-invariant vector field	Concept	Topological groups, Lie groups
Laplace's equation	Definition	Partial differential equations
Delta derivative on a time scale	Definition	Real functions
Expectation–maximization algorithm	Definition	Statistics
Volterra equation of convolution type	Concept	Integral equations
Generalized Fourier series	Concept	Harmonic analysis on Euclidean spaces
Order of a difference equation	Concept	Difference and functional equations
Whitney immersion theorem	Theorem	Manifolds and cell complexes
Wang's finiteness theorem	Theorem	Topological groups, Lie groups
Delay differential equation	Definition	Ordinary differential equations
Hasse principle	Definition	Number theory
Non-Euclidean geometry	Concept	Geometry
Segre's theorem	Theorem	Geometry
Carleman's singular integral equation	Example	Integral equations
Topological group structure of a vector space	Concept	Functional analysis
Spherical geometry	Concept	Geometry
Auslander–Buchsbaum formula	Theorem	Commutative algebra
Remez algorithm	Definition	Numerical analysis
Carleson measure	Concept	Functions of a complex variable
Hadamard product	Concept	Linear and multilinear algebra; matrix theory
Gaussian curvature	Concept	Differential geometry
Abelian extension	Definition	Field theory and polynomials
Ultrafilter	Definition	General topology
Hotelling's T-squared distribution	Definition	Statistics
Functional equation	Concept	Difference and functional equations
Weak homotopy equivalence	Definition	Algebraic topology
Heaviside cover-up method	Concept	Real functions
String diagram	Definition	Category theory; homological algebra
Braid group	Definition	Group theory and generalizations
Equioscillation theorem	Theorem	Approximations and expansions
Convergence of Fourier series	Definition	Harmonic analysis on Euclidean spaces
Polynomial interpolation	Concept	Approximations and expansions
Bäcklund transform	Concept	Dynamical systems and ergodic theory
Beth number	Concept	Mathematical logic and foundations
Complete set of orthogonal idempotents	Concept	Associative rings and algebras
Seeley–DeWitt coefficients	Definition	Global analysis, analysis on manifolds
Pitman–Koopman–Darmois theorem	Theorem	Statistics
Inner regular measure	Definition	Measure and integration
Hausdorff dimension	Concept	Measure and integration
Monomorphism	Definition	Category theory; homological algebra
Whitney's theorem on folds and cusps	Theorem	Manifolds and cell complexes
Initial value problem for a recurrence	Concept	Difference and functional equations
Elliptic boundary value problem	Definition	Partial differential equations
Betti number	Concept	Algebraic topology
Tight frame	Definition	Harmonic analysis on Euclidean spaces
Poisson regression	Concept	Statistics
Cauchy's power equation	Definition	Difference and functional equations
Wiener's criterion	Theorem	Potential theory
Boolean prime ideal theorem	Theorem	Mathematical logic and foundations
Krull dimension of a poset	Definition	Order, lattices, ordered algebraic structures
Inductive dimension	Definition	General topology
Calabi–Yau manifold	Concept	Algebraic geometry
Moise's theorem	Theorem	Manifolds and cell complexes
Surface of general type	Concept	Algebraic geometry
Cusp form	Definition	Number theory
Lelong class	Definition	Several complex variables and analytic spaces
Non-atomic measure	Concept	Measure and integration
Trigonometric interpolation	Concept	Harmonic analysis on Euclidean spaces
Isomonodromic deformation	Definition	Ordinary differential equations
Homogeneous and inhomogeneous linear recurrences	Definition	Difference and functional equations
Kummer–Artin–Schreier–Witt theory	Definition	Field theory and polynomials
Hadwiger covering conjecture	Conjecture	Convex and discrete geometry
Pairwise summation	Theorem	Numerical analysis