Every idea

Ideas 14251–14400 of 19838.

Name	Kind	Subject
Thin airfoil theory	Definition	Fluid mechanics
Boolean model	Concept	Probability theory and stochastic processes
Moduli of algebraic curves	Concept	Algebraic geometry
Alexander subbase theorem	Theorem	General topology
Normal modes of the Earth	Concept	Geophysics
Ergodic hypothesis	Concept	Dynamical systems and ergodic theory
Subobject classifier	Concept	Category theory; homological algebra
Snowball Earth bifurcation	Proposition	Geophysics
Douglas' lemma	Lemma	Operator theory
Rigid body dynamics	Concept	Mechanics of particles and systems
Plane wave	Concept	Optics, electromagnetic theory
Absorbing set	Concept	Functional analysis
Givens rotation	Concept	Numerical analysis
Hermitian kernel	Definition	Integral equations
Kerr–Newman metric	Example	Relativity and gravitational theory
Category O	Concept	Nonassociative rings and algebras
Viscosity	Concept	Fluid mechanics
Lie subgroup	Concept	Topological groups, Lie groups
Optical aberration	Definition	Optics, electromagnetic theory
Six-term exact sequence	Theorem	Functional analysis
Anisotropic elasticity	Concept	Mechanics of deformable solids
Bouguer anomaly	Concept	Geophysics
Radical of a Lie algebra	Definition	Nonassociative rings and algebras
K-theory of Cuntz algebras	Example	Functional analysis
Euler force	Definition	Mechanics of particles and systems
Complete theory	Definition	Mathematical logic and foundations
Cyclotomic field	Concept	Number theory
Reflexive space	Concept	Functional analysis
Inner function	Concept	Functions of a complex variable
Γ-convergence	Definition	Calculus of variations and optimal control; optimization
Free Lie algebra	Concept	Nonassociative rings and algebras
Eilenberg–Moore spectral sequence	Theorem	Algebraic topology
Fermi liquid theory	Definition	Statistical mechanics, structure of matter
Linkage disequilibrium	Definition	Biology and other natural sciences
Approximation theory	Definition	Approximations and expansions
Syndrome decoding	Definition	Information and communication theory, circuits
Resultant	Concept	Commutative algebra
Neumann formula for mutual inductance	Theorem	Optics, electromagnetic theory
Degree of a central simple algebra	Concept	Associative rings and algebras
Gene regulatory network	Concept	Biology and other natural sciences
Bernstein's problem	Problem	Differential geometry
Tame symbol	Concept	K-theory
Hilbert–Schmidt operator	Definition	Operator theory
Cantor function	Counterexample	Real functions
Group of Lie type	Concept	Group theory and generalizations
Completion of a normed space	Definition	Functional analysis
Completion is flat	Theorem	Commutative algebra
Value iteration and policy iteration	Concept	Operations research, mathematical programming
Derived functor	Concept	Category theory; homological algebra
Veblen–Young theorem	Theorem	Geometry
Pullback	Definition	Category theory; homological algebra
Electric displacement field	Definition	Optics, electromagnetic theory
Topology generated by a family of seminorms	Definition	Functional analysis
Topological mixing	Definition	Dynamical systems and ergodic theory
Shape-memory alloy	Definition	Mechanics of deformable solids
Solar dynamo	Concept	Astronomy and astrophysics
Infinite Galois theory	Definition	Field theory and polynomials
Fractional programming	Concept	Operations research, mathematical programming
Goldreich–Tremaine theory of disk–satellite interaction	Concept	Astronomy and astrophysics
Computational complexity theory	Definition	Computer science
Szemerédi–Trotter theorem	Theorem	Convex and discrete geometry
Bernstein's theorem on absolutely convergent Fourier series	Theorem	Harmonic analysis on Euclidean spaces
GCD domain	Definition	Commutative algebra
Dickson's lemma	Lemma	Order, lattices, ordered algebraic structures
Period-doubling bifurcation	Concept	Dynamical systems and ergodic theory
Infinitely divisible distribution	Definition	Probability theory and stochastic processes
Inventory theory	Concept	Operations research, mathematical programming
Supervisory control theory of discrete event systems	Concept	Systems theory; control
Conway polynomial	Concept	Number theory
p-harmonic function	Definition	Potential theory
XXZ model	Example	Statistical mechanics, structure of matter
Ancillary statistic	Definition	Statistics
Hilbert's fifth problem	Problem	Topological groups, Lie groups
Index ellipsoid	Concept	Optics, electromagnetic theory
Fourier transform method for convolution equations	Concept	Integral equations
Riemann's existence theorem	Theorem	Functions of a complex variable
Uniform module	Definition	Associative rings and algebras
Dvoretzky's theorem	Theorem	Functional analysis
Derivative function	Concept	Real functions
Chemical master equation	Definition	Probability theory and stochastic processes
Nusselt film condensation theory	Concept	Classical thermodynamics, heat transfer
Saccheri quadrilateral	Definition	Geometry
Optimization problem	Concept	Operations research, mathematical programming
Hyperarithmetical theory	Concept	Mathematical logic and foundations
Lattice in a locally compact group	Concept	Topological groups, Lie groups
Relativistic Lagrangian of a free particle	Concept	Mechanics of particles and systems
Tsfasman–Vlăduț–Zink bound	Theorem	Information and communication theory, circuits
Torus knot	Concept	Manifolds and cell complexes
Completion of a ring	Definition	Commutative algebra
Symmetric function	Definition	Combinatorics
Functor of points	Definition	Algebraic geometry
Kuratowski closure axioms	Concept	General topology
Bayes factor	Concept	Statistics
Hilbert transform	Concept	Integral transforms, operational calculus
Elastic collision	Concept	Mechanics of particles and systems
Zeros and poles of a system	Concept	Systems theory; control
Q factor	Concept	Mechanics of particles and systems
Supermartingale	Concept	Probability theory and stochastic processes
Configuration space	Definition	Mechanics of particles and systems
Causal system	Concept	Systems theory; control
Cantor's uniqueness theorem for trigonometric series	Theorem	Harmonic analysis on Euclidean spaces
Alexandrov–Zeeman theorem	Theorem	Relativity and gravitational theory
Fenchel–Young inequality	Theorem	Convex and discrete geometry
Equicontinuous system	Concept	Dynamical systems and ergodic theory
Littlewood–Paley decomposition	Definition	Harmonic analysis on Euclidean spaces
Geodesic	Concept	Differential geometry
Successor order	Concept	Order, lattices, ordered algebraic structures
Hermitian symmetric space	Concept	Several complex variables and analytic spaces
Minkowski–Carathéodory theorem	Theorem	Convex and discrete geometry
Commutative Gelfand–Naimark theorem	Theorem	Functional analysis
Tetration	Example	Real functions
Fibred category	Concept	Category theory; homological algebra
Shallow water equations	Concept	Fluid mechanics
Reiterman's theorem	Theorem	General algebraic systems
Kummer's equation	Concept	Special functions
Grothendieck group of an abelian category	Definition	Category theory; homological algebra
Resonance	Definition	Ordinary differential equations
Sierpiński space	Example	General topology
Cofinality	Definition	Mathematical logic and foundations
Condenser capacity	Concept	Potential theory
Specht module	Concept	Group theory and generalizations
Stopped process	Definition	Probability theory and stochastic processes
Balayage	Concept	Potential theory
Potential flow	Definition	Fluid mechanics
Lawvere theory	Concept	Category theory; homological algebra
Švarc–Milnor lemma	Theorem	Group theory and generalizations
Jeffreys prior	Definition	Statistics
Fundamental group	Definition	Algebraic topology
Einstein solid	Example	Statistical mechanics, structure of matter
Linear type system	Definition	Computer science
U-statistic	Concept	Statistics
Steinitz theorem on convex hull interiors	Theorem	Convex and discrete geometry
Critical path method	Concept	Operations research, mathematical programming
Tauberian theorems for integral transforms	Theorem	Sequences, series, summability
Screw theory	Concept	Mechanics of particles and systems
Splitting field of a central simple algebra	Concept	Associative rings and algebras
Kirillov orbit method	Definition	Topological groups, Lie groups
Mathematical formulation of the Standard Model	Concept	Quantum theory
Crossed product	Definition	Functional analysis
Numerical differentiation	Concept	Numerical analysis
Chern character	Definition	K-theory
Brown–Peterson cohomology	Definition	Algebraic topology
Transcendence degree	Definition	Field theory and polynomials
Finitely generated variety	Concept	General algebraic systems
Korteweg–De Vries equation	Definition	Partial differential equations
Addition theorem for spherical harmonics	Theorem	Special functions
Associated bundle	Concept	Algebraic topology
Følner sequence	Definition	Abstract harmonic analysis
Weak equivalence	Definition	Category theory; homological algebra
Inverse quadratic interpolation	Theorem	Numerical analysis