Every idea

Ideas 20251–20400 of 21839.

Name	Kind	Subject
Knuth–Morris–Pratt algorithm	Definition	Computer science
Effective resistance	Concept	Potential theory
Hodge conjecture	Conjecture	Algebraic geometry
Metamaterial cloaking	Concept	Optics, electromagnetic theory
Beilinson regulator	Definition	K-theory
Pauli matrices	Object	Quantum theory
Inverse limit	Definition	Category theory; homological algebra
Quasi-Monte Carlo method	Definition	Numerical analysis
Khovanov homology	Concept	Manifolds and cell complexes
Extraction sums of squared loadings	Concept
Pseudo-spectral method	Concept	Numerical analysis
Strong gravitational lensing	Definition	Astronomy and astrophysics
CAT(0) group	Concept	Group theory and generalizations
Accessibility relation	Concept
Schnirelmann density	Definition	Number theory
Bezoutic	Concept
Cotlar–Stein lemma	Lemma	Harmonic analysis on Euclidean spaces
Lindelöf's theorem	Theorem	Functions of a complex variable
Euler–Poisson equation for higher derivatives	Concept	Calculus of variations and optimal control; optimization
Incomplete LU factorization	Concept	Numerical analysis
J-homomorphism	Definition	Algebraic topology
Thermal conductivity	Concept	Classical thermodynamics, heat transfer
Laplace–Runge–Lenz vector	Definition	Mechanics of particles and systems
Receiver function	Concept	Geophysics
Index map	Concept	Functional analysis
Negation consistency	Concept
Harmonic space	Definition	Potential theory
Associated graded ring	Definition	Commutative algebra
Proof of Cantor's theorem by the diagonal argument	Proof	Mathematical logic and foundations
Local martingale	Concept	Probability theory and stochastic processes
Kovacic's algorithm	Concept	Ordinary differential equations
Nuclear space	Concept	Functional analysis
Gromoll–Meyer theorem on closed geodesics	Theorem	Global analysis, analysis on manifolds
Prime ring	Definition	Associative rings and algebras
A linearly independent set in R^m has at most m vectors	Proposition	Linear and multilinear algebra; matrix theory
Proof that binary trees are counted by Catalan numbers	Proof	Combinatorics
Classification of simple Lie algebras	Theorem	Nonassociative rings and algebras
Probit model	Concept	Statistics
Bühlmann model	Definition	Game theory, economics, finance, and other social and behavioral sciences
Blocking	Concept	Statistics
Quicksort	Definition	Computer science
Model order reduction	Definition	Systems theory; control
Primal algebra	Concept	General algebraic systems
A subgroup of order two in S3 is not normal	Example	Group theory and generalizations
Unary algebra	Concept	General algebraic systems
Watterson estimator	Concept	Statistics
Karnaugh map	Definition	Information and communication theory, circuits
Work hardening	Concept	Mechanics of deformable solids
Affine plane	Definition	Geometry
Biconditional elimination	Concept
Simple Lie algebra	Concept	Nonassociative rings and algebras
Fubini's theorem on differentiation	Theorem	Real functions
Metric outer measure	Definition	Measure and integration
Harmonic polynomial	Definition	Potential theory
Branch point	Definition	Functions of a complex variable
Square root of a positive operator	Definition	Operator theory
Nagata ring	Definition	Commutative algebra
Taylor–von Neumann–Sedov blast wave	Example	Fluid mechanics
Brauer–Manin obstruction	Concept	Algebraic geometry
Proof of the product rule in several variables	Proof	Real functions
Fox–Wright function	Concept	Special functions
Section of a vector bundle	Definition	Algebraic topology
Face lattice	Example	Convex and discrete geometry
Robin boundary condition for convective cooling	Concept	Classical thermodynamics, heat transfer
Lebesgue–Stieltjes measure	Definition	Measure and integration
Faddeeva function	Definition	Special functions
Modulation space	Definition	Harmonic analysis on Euclidean spaces
Jucys–Murphy element	Concept
Gauss–Laguerre quadrature	Theorem	Numerical analysis
Criss-cross algorithm	Concept	Operations research, mathematical programming
Four-dimensional variational assimilation	Definition	Geophysics
Square root of a matrix	Definition	Linear and multilinear algebra; matrix theory
Best approximation	Definition	Approximations and expansions
Asymptotic scale	Concept	Approximations and expansions
Yield surface	Definition	Mechanics of deformable solids
Anticommutative algebra	Definition	Nonassociative rings and algebras
Siegel–Walfisz theorem	Theorem	Number theory
F-sigma set	Definition	General topology
Brown–Douglas–Fillmore theory	Definition	K-theory
Leech lattice	Object	Number theory
Filippov's existence theorem	Theorem	Calculus of variations and optimal control; optimization
Proof of the Chevalley–Warning theorem	Proof	Number theory
Adjoint integral equation	Concept	Integral equations
Kirchberg–Phillips classification theorem	Theorem	Functional analysis
Elastic metamaterial	Definition	Mechanics of deformable solids
Ore's conjecture	Proposition
Proof of the vector calculus identities	Proof	Real functions
Plus construction	Concept	K-theory
Kontorovich–Lebedev transform	Concept	Integral transforms, operational calculus
Superalgebra	Definition	Nonassociative rings and algebras
Continuous q-Hermite polynomials	Concept	Special functions
Amenable semigroup	Definition	Abstract harmonic analysis
Sturmian word	Example	Computer science
Compressibility	Definition	Classical thermodynamics, heat transfer
Naive set theory	Concept	Mathematical logic and foundations
Hadamard's two-constants theorem	Theorem	Functions of a complex variable
Colimit	Definition	Category theory; homological algebra
Cartan–Kähler theorem	Theorem	Global analysis, analysis on manifolds
Regular semigroup	Concept	Group theory and generalizations
Stability conjecture	Theorem	Dynamical systems and ergodic theory
Plateau–Rayleigh instability	Concept	Fluid mechanics
Colombeau algebra	Concept	Functional analysis
Strengthened version of Van Kampen's lemma	Lemma
Analytic combinatorics	Definition	Combinatorics
Kähler manifold	Definition	Several complex variables and analytic spaces
Preconditioner	Definition	Numerical analysis
Cluster expansion	Concept	Statistical mechanics, structure of matter
Einstein static universe	Example	Relativity and gravitational theory
Elliptic cohomology	Concept	Algebraic topology
Train track	Concept	Manifolds and cell complexes
Moreau envelope	Definition	Operations research, mathematical programming
Repeated game	Concept	Game theory, economics, finance, and other social and behavioral sciences
Geometric realization	Definition	Algebraic topology
Johnson's rule	Theorem	Operations research, mathematical programming
Linear matrix inequality	Concept	Linear and multilinear algebra; matrix theory
Noether's theorem	Theorem	Mechanics of particles and systems
Proof of the comparability of cardinals from Zorn's lemma	Proof	Mathematical logic and foundations
Skorokhod's embedding theorem	Theorem	Probability theory and stochastic processes
Beckman–Quarles theorem	Theorem	Geometry
Decay of Fourier coefficients and smoothness	Theorem	Harmonic analysis on Euclidean spaces
Interacting particle system	Definition	Probability theory and stochastic processes
Polyharmonic spline	Concept	Approximations and expansions
Separated morphism	Definition	Algebraic geometry
Landau theory	Concept	Statistical mechanics, structure of matter
Proof of the divisibility rule for 3	Proof	Number theory
Normal fan	Concept	Convex and discrete geometry
Cryptographic hash function	Concept	Information and communication theory, circuits
Gleason–Yamabe theorem	Theorem	Topological groups, Lie groups
Chapman–Ferraro problem	Problem	Geophysics
Proof that a set is open if and only if its complement is closed	Proof	General topology
Weak mathematical induction	Concept
Algebraic curve	Concept	Algebraic geometry
Curvelet	Definition	Harmonic analysis on Euclidean spaces
p-Laplacian	Concept	Partial differential equations
Geometric phase	Definition	Quantum theory
Inclusion–exclusion formula for elements with none of the properties	Theorem	Combinatorics
Eilenberg–MacLane spectrum	Object	Algebraic topology
Travelling salesman problem	Problem	Operations research, mathematical programming
Semisimple Lie group	Concept	Topological groups, Lie groups
Harmony	Concept
Mellin inversion theorem	Theorem	Integral transforms, operational calculus
Abelian algebra	Definition	General algebraic systems
Kleene–Brouwer order	Concept
Best response	Definition	Game theory, economics, finance, and other social and behavioral sciences
Frobenius's theorem on Frobenius kernels	Theorem	Group theory and generalizations
Generalized least squares	Definition	Statistics
Hilbert scheme	Object	Algebraic geometry
Galois insertion	Definition	Order, lattices, ordered algebraic structures
Existence predicate	Concept
Szász–Mirakyan operator	Definition	Approximations and expansions