Nodes at W0, stub

A tag, a kind, a name, an inventory row, and a same_as or a source.

Ideas 18301–18450 of 19205.

Name	Kind	Subject
Sturm separation theorem	Theorem	Ordinary differential equations
Richtmyer–Meshkov instability	Concept	Fluid mechanics
Random dynamical system	Definition	Dynamical systems and ergodic theory
Uniform diagonal lemma	Lemma
Nagata's example of a Noetherian ring of infinite dimension	Counterexample	Commutative algebra
Earth tide	Definition	Geophysics
von Neumann bounded set	Definition	Functional analysis
Schläfli symbol	Definition	Geometry
Banzhaf power index	Concept	Game theory, economics, finance, and other social and behavioral sciences
HNN extension	Concept	Group theory and generalizations
Bond percolation	Definition	Statistical mechanics, structure of matter
Quasi-analytic function	Concept	Real functions
Unirational variety	Concept	Algebraic geometry
Robin constant	Definition	Potential theory
Proof of the logarithm of a product	Proof	Special functions
Limit set	Concept	Dynamical systems and ergodic theory
Weber number	Definition	Fluid mechanics
Incompatibility with the axiom of choice	Proposition
Excellent ring	Concept	Commutative algebra
Social welfare function	Definition	Game theory, economics, finance, and other social and behavioral sciences
Zero morphism	Concept	Category theory; homological algebra
Generalized cohomology theory	Definition	Algebraic topology
Isomorphism theorem for measure algebras	Theorem	Measure and integration
Hilbert's Theorem 90	Theorem	Field theory and polynomials
Order of a PDE	Definition	Partial differential equations
Unit hydrograph	Definition	Geophysics
Model of computation	Concept	Computer science
Helioseismology	Concept	Astronomy and astrophysics
Holomorphic functional calculus	Concept	Operator theory
Lifting-line theory	Concept	Fluid mechanics
Waveguide	Definition	Optics, electromagnetic theory
Malcev completion	Definition	Topological groups, Lie groups
Birkhoff–Frink representation of algebraic closure systems	Theorem	General algebraic systems
Jerk	Definition	Mechanics of particles and systems
Creep	Concept	Mechanics of deformable solids
(∞,1)-category	Concept	Category theory; homological algebra
Uniform boundedness principle	Theorem	Functional analysis
Gradient wind	Definition	Geophysics
Finite field arithmetic	Concept	Field theory and polynomials
Arrhenius equation	Fact	Classical thermodynamics, heat transfer
Dirichlet energy	Concept	Potential theory
Dissipative operator	Definition	Operator theory
Proper time	Concept	Relativity and gravitational theory
Choquet capacity	Definition	Measure and integration
Toomre's stability criterion	Theorem	Astronomy and astrophysics
Operator theory	Concept	Operator theory
Projective object	Definition	Category theory; homological algebra
Chebyshev–Markov–Stieltjes inequalities	Theorem	Integral transforms, operational calculus
Reciprocal gamma function	Definition	Special functions
Heat kernel	Definition	Partial differential equations
Period map	Concept	Several complex variables and analytic spaces
Bonferroni correction	Definition	Statistics
Quantum invariant of 3-manifolds	Concept	Manifolds and cell complexes
Olbers' paradox	Problem	Astronomy and astrophysics
Reflexive operator algebra	Definition	Operator theory
Gromov's compactness theorem	Theorem	Differential geometry
A Dedekind UFD is a PID	Proposition	Commutative algebra
Thermodynamic limit	Definition	Statistical mechanics, structure of matter
Finitely based algebra	Concept	General algebraic systems
Triangulation	Concept	Manifolds and cell complexes
Scaling function and refinement equation	Concept	Harmonic analysis on Euclidean spaces
Synthetic geometry	Definition	Geometry
Semilocal ring	Definition	Associative rings and algebras
One-parameter subgroup	Concept	Topological groups, Lie groups
Hilbert's axioms	Definition	Geometry
Langlands classification	Theorem	Topological groups, Lie groups
Automorphism group of a bounded domain is a Lie group	Theorem	Several complex variables and analytic spaces
Black hole	Concept	Relativity and gravitational theory
Poincaré–Lindstedt method	Concept	Ordinary differential equations
Eilenberg–Steenrod axioms	Concept	Algebraic topology
Perspective projection	Concept	Geometry
Proof of the Wallis product by integrals of powers of sine	Proof	Number theory
Doob decomposition theorem	Theorem	Probability theory and stochastic processes
Reynolds number	Definition	Fluid mechanics
Lax–Wendroff method	Concept	Numerical analysis
Lie superalgebra	Definition	Nonassociative rings and algebras
Fredholm integral equation	Definition	Integral equations
Lommel function	Concept	Special functions
Chandrasekhar's X- and Y-functions	Example	Integral equations
Symmetric decreasing rearrangement	Definition	Real functions
Sphere packing in dimensions 8 and 24	Theorem	Convex and discrete geometry
Identity alone	Proposition
Combinatorics on words	Concept	Computer science
WKB approximation	Concept	Ordinary differential equations
Principle of duality	Proposition
Loop algebra	Concept	Nonassociative rings and algebras
Trigonometric moment problem	Problem	Harmonic analysis on Euclidean spaces
Ramification group	Definition	Number theory
Analytic combinatorics	Concept	Combinatorics
Wedderburn's theorem on simple Artinian rings	Theorem	Associative rings and algebras
Ruled surface	Definition	Algebraic geometry
Ruppeiner geometry	Concept	Classical thermodynamics, heat transfer
Commuting elements	Concept	General algebraic systems
3-j symbol	Concept	Special functions
Inverse Galois problem	Problem	Field theory and polynomials
Locally decodable code	Concept	Information and communication theory, circuits
Inhomogeneous electromagnetic wave equation	Definition	Optics, electromagnetic theory
Proof that congruence is compatible with powers	Proof	Number theory
Paris' law	Fact	Mechanics of deformable solids
Bellman–Ford algorithm	Definition	Combinatorics
Mirror symmetry	Concept	Algebraic geometry
Multitape Turing machine	Concept	Computer science
Ambiguity function	Definition	Information and communication theory, circuits
Discrete Dirichlet problem	Problem	Potential theory
International Geomagnetic Reference Field	Object	Geophysics
Kauffman bracket	Definition	Manifolds and cell complexes
Coleman–Mandula theorem	Theorem	Quantum theory
Theorema Egregium	Theorem	Differential geometry
Developable surface	Concept	Differential geometry
Effective temperature	Definition	Astronomy and astrophysics
Circle average	Definition	Potential theory
Likelihood-ratio test	Concept	Statistics
Hamilton's principal function	Concept	Mechanics of particles and systems
Perturbation theory in quantum mechanics	Definition	Quantum theory
Rellich–Kondrachov theorem	Theorem	Functional analysis
Bland's rule	Concept	Operations research, mathematical programming
Multiplication theorem	Theorem	Special functions
Ordinary least squares	Concept	Statistics
Local asymptotic normality	Definition	Statistics
Planetary migration	Concept	Astronomy and astrophysics
Bochner–Martinelli formula	Theorem	Several complex variables and analytic spaces
Site	Definition	Category theory; homological algebra
Bochner's tube theorem	Theorem	Several complex variables and analytic spaces
Stably free module	Concept	K-theory
Bredon cohomology	Concept	Algebraic topology
Capillary wave	Definition	Fluid mechanics
Log mean temperature difference	Definition	Classical thermodynamics, heat transfer
Harish-Chandra isomorphism	Theorem	Nonassociative rings and algebras
Frequentist inference	Definition	Statistics
Incidence matrix	Definition	Combinatorics
Harnack's inequality	Theorem	Potential theory
Gumm terms	Definition	General algebraic systems
Restricted Lie algebra	Definition	Nonassociative rings and algebras
Kappa mechanism	Definition	Astronomy and astrophysics
Proof of the integral of 1/x	Proof	Real functions
Synchronization of chaos	Concept	Ordinary differential equations
Proof that continuity is equivalent to sequential continuity in metric spaces	Proof	General topology
Proof that the Cauchy product of absolutely convergent series converges absolutely to the product	Proof	Sequences, series, summability
Nonassociative ring	Concept	Nonassociative rings and algebras
Proof that the curl of a gradient is zero	Proof	Real functions
Chevalley group	Concept	Group theory and generalizations
Integer factorization	Problem	Number theory
Affine arithmetic	Concept	Numerical analysis
Approximation theory	Concept	Approximations and expansions
Proof that pi is greater than 3 by the alternating series estimate	Proof	Number theory
Subfactor	Definition	Functional analysis
1 + 1 + 1 + 1 + ⋯	Example	Sequences, series, summability
Verma module	Definition	Nonassociative rings and algebras
Equation of state	Concept	Classical thermodynamics, heat transfer
Baker–Gammel–Wills conjecture	Conjecture	Approximations and expansions