Every idea

Ideas 14551–14700 of 19838.

Name	Kind	Subject
Tensor algebra	Concept	Linear and multilinear algebra; matrix theory
Surface	Definition	Manifolds and cell complexes
Burgers' equation	Definition	Partial differential equations
Hilbert manifold	Definition	Global analysis, analysis on manifolds
Kervaire invariant	Concept	Algebraic topology
Approximation algorithm	Definition	Computer science
Zassenhaus neighbourhood	Definition	Topological groups, Lie groups
Mahalanobis distance	Concept	Statistics
Fortuin–Kasteleyn random cluster model	Definition	Statistical mechanics, structure of matter
Singular function	Concept	Real functions
L-theory	Concept	K-theory
Mellin convolution	Definition	Integral transforms, operational calculus
Moufang plane	Definition	Geometry
Complete atomic Boolean algebra	Concept	Order, lattices, ordered algebraic structures
Turing degree	Concept	Mathematical logic and foundations
Lower K-groups	Concept	K-theory
Interior Schwarzschild metric	Example	Relativity and gravitational theory
Random energy model	Example	Statistical mechanics, structure of matter
Queueing theory	Concept	Probability theory and stochastic processes
Topological group	Definition	Topological groups, Lie groups
Connective constant	Concept	Statistical mechanics, structure of matter
Rescorla–Wagner model	Definition	Game theory, economics, finance, and other social and behavioral sciences
Slice knot	Concept	Manifolds and cell complexes
Chain complex	Definition	Category theory; homological algebra
Local solvability	Concept	Partial differential equations
Equicontinuous system	Definition	Dynamical systems and ergodic theory
Wirtinger presentation	Theorem	Manifolds and cell complexes
Molecular dynamics	Concept	Statistical mechanics, structure of matter
Racah polynomials	Concept	Special functions
Weak topology	Concept	Functional analysis
Algebraic K-theory of schemes	Definition	K-theory
Grothendieck–Lefschetz trace formula	Theorem	Algebraic geometry
Lie's third theorem	Theorem	Topological groups, Lie groups
Margulis lemma	Theorem	Differential geometry
Adjoint representation of a Lie group	Concept	Topological groups, Lie groups
Phase diagram	Definition	Classical thermodynamics, heat transfer
Smooth four-dimensional Poincaré conjecture	Conjecture	Manifolds and cell complexes
Decidable language	Concept	Mathematical logic and foundations
Characterizations of Galois extensions	Theorem	Field theory and polynomials
Contact geometry of thermodynamics	Definition	Classical thermodynamics, heat transfer
Work hardening	Definition	Mechanics of deformable solids
Wilson loop	Definition	Quantum theory
Rayleigh–Jeans law	Proposition	Classical thermodynamics, heat transfer
Real K-theory KO	Concept	Algebraic topology
Higman embedding theorem	Theorem	Group theory and generalizations
Group law on an elliptic curve	Concept	Algebraic geometry
Thermal conductivity	Definition	Classical thermodynamics, heat transfer
Isotonic regression	Definition	Statistics
Parallel transport	Definition	Differential geometry
Train track	Definition	Manifolds and cell complexes
Cartan–Eilenberg resolution	Definition	Category theory; homological algebra
Pitchfork bifurcation	Concept	Ordinary differential equations
Uniform structure of a topological group	Concept	Topological groups, Lie groups
Folk theorem of evolutionary game theory	Theorem	Game theory, economics, finance, and other social and behavioral sciences
Jentzsch's theorem on positive kernels	Theorem	Integral equations
Littlewood conjecture	Conjecture	Number theory
Differential graded algebra	Definition	Associative rings and algebras
Octahedral axiom	Concept	Category theory; homological algebra
Lorentz's characterization of almost convergence	Theorem	Sequences, series, summability
Elsasser number	Concept	Fluid mechanics
Local homomorphism	Concept	Commutative algebra
Compressible flow	Definition	Fluid mechanics
Hilbert metric	Concept	Geometry
Kadomtsev–Petviashvili equation	Concept	Partial differential equations
Positive operator	Definition	Operator theory
Bayesian hierarchical model	Concept	Statistics
Nilpotent operator	Definition	Operator theory
Homotopy group	Concept	Algebraic topology
Sphere	Concept	Geometry
Kalman–Bucy filter	Concept	Systems theory; control
Lagrangian relaxation	Concept	Operations research, mathematical programming
Reynolds decomposition	Definition	Fluid mechanics
Hypercube	Example	Convex and discrete geometry
Thom–Mather stratified space	Concept	Global analysis, analysis on manifolds
Group homology	Definition	Group theory and generalizations
Uniform theory of diffraction	Concept	Optics, electromagnetic theory
Thin plate spline	Concept	Approximations and expansions
S-finite measure	Concept	Measure and integration
Round-off error	Definition	Numerical analysis
Fin heat transfer	Definition	Classical thermodynamics, heat transfer
Developable surface	Definition	Differential geometry
Turing reduction	Concept	Mathematical logic and foundations
Mean curvature	Concept	Differential geometry
Inverse Mellin transform	Definition	Integral transforms, operational calculus
Löwner's theorem	Theorem	Operator theory
Symmetric space	Concept	Differential geometry
Chern class	Concept	Algebraic geometry
Tucker's lemma	Lemma	Combinatorics
Lattice model	Concept	Statistical mechanics, structure of matter
Miles–Howard theorem	Theorem	Fluid mechanics
Grauert's theorem on real analytic manifolds	Theorem	Several complex variables and analytic spaces
Laplace–Beltrami operator	Definition	Global analysis, analysis on manifolds
Symmetric function	Concept	Combinatorics
Combinatorial design	Concept	Combinatorics
Contingency table	Concept	Statistics
Frobenius reciprocity	Theorem	Group theory and generalizations
Conic optimization	Concept	Operations research, mathematical programming
Natural deduction	Definition	Mathematical logic and foundations
Minkowski functional	Concept	Functional analysis
Double series	Concept	Sequences, series, summability
Intrinsic volume	Definition	Convex and discrete geometry
Grand potential	Concept	Classical thermodynamics, heat transfer
Motzkin number	Concept	Combinatorics
Serre fibration	Concept	Algebraic topology
Pseudo-element	Definition	Category theory; homological algebra
Haar system	Definition	Harmonic analysis on Euclidean spaces
Symmetric algebra	Concept	Linear and multilinear algebra; matrix theory
Word problem for groups	Problem	Group theory and generalizations
Fractional factorial design	Concept	Statistics
Muirhead's inequality	Theorem	Real functions
Artin's theorem on alternative algebras	Theorem	Nonassociative rings and algebras
Painlevé conjecture on noncollision singularities	Theorem	Mechanics of particles and systems
Discrete spectrum	Definition	Operator theory
F-distribution	Concept	Statistics
Simple polytope	Definition	Convex and discrete geometry
Congestion game	Definition	Game theory, economics, finance, and other social and behavioral sciences
Choquet theory	Definition	Functional analysis
Well-quasi-ordering	Definition	Order, lattices, ordered algebraic structures
Recurrence and transience of states	Concept	Probability theory and stochastic processes
Comma category	Concept	Category theory; homological algebra
Shannon's source coding theorem	Theorem	Information and communication theory, circuits
Uniform theory of diffraction	Definition	Optics, electromagnetic theory
Bessel's integral	Proposition	Special functions
Derived category	Definition	Category theory; homological algebra
Weber–Fechner law	Fact	Game theory, economics, finance, and other social and behavioral sciences
Multiplicative set	Definition	Commutative algebra
Skew group ring	Concept	Associative rings and algebras
Sierpiński carpet	Example	General topology
Inverse problem	Concept	Partial differential equations
Levi-Civita connection	Definition	Differential geometry
Generalized polygon	Concept	Geometry
Digamma function	Definition	Special functions
State on a C*-algebra	Definition	Functional analysis
Convergence of an infinite product	Concept	Sequences, series, summability
Poisson integral formula	Theorem	Potential theory
Commutative algebra over a ring	Definition	Commutative algebra
Polydisc	Definition	Several complex variables and analytic spaces
Residual set	Definition	General topology
Shelf	Concept	Group theory and generalizations
CW approximation	Theorem	Algebraic topology
Laguerre–Pólya class	Definition	Functions of a complex variable
Toda's theorem	Theorem	Computer science
Displacement convexity	Definition	Calculus of variations and optimal control; optimization
Unit ball in C^n	Object	Several complex variables and analytic spaces
Asteroseismology	Concept	Astronomy and astrophysics
Bishop–Phelps theorem	Theorem	Functional analysis
Needleman–Wunsch algorithm	Concept	Biology and other natural sciences
Fast wavelet transform	Concept	Numerical analysis
Gateaux derivative	Definition	Functional analysis
Mori–Tanaka method	Definition	Mechanics of deformable solids