Nodes at W0, stub

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

Ideas 2101–2250 of 6044.

Name	Kind	Subject
Nörlund mean	Definition	Sequences, series, summability
Latin square	Definition	Combinatorics
Sorgenfrey plane	Counterexample	General topology
Scheffé's lemma	Lemma	Measure and integration
Pseudosphere	Example	Differential geometry
Digital topology	Concept	Computer science
Renewal theory	Concept	Probability theory and stochastic processes
Hodge star operator	Definition	Global analysis, analysis on manifolds
Union-closed sets conjecture	Conjecture	Combinatorics
Block system	Definition	Group theory and generalizations
Series in Banach spaces	Definition	Sequences, series, summability
Formalism	Concept	Mathematical logic and foundations
Palais–Smale compactness condition	Concept	Global analysis, analysis on manifolds
Separation of variables	Concept	Ordinary differential equations
Monotone operator	Definition	Operator theory
Second-order logic	Definition	Mathematical logic and foundations
Löwenheim–Skolem theorem	Theorem	Mathematical logic and foundations
Near-field	Definition	Field theory and polynomials
Sumset	Definition	Number theory
Hermitian form	Concept	Linear and multilinear algebra; matrix theory
Jensen's formula	Theorem	Functions of a complex variable
Weierstrass preparation theorem	Theorem	Commutative algebra
Sectional curvature	Definition	Differential geometry
Homotopic maps	Definition	Algebraic topology
Continuous dual space	Concept	Functional analysis
Soundness	Concept	Mathematical logic and foundations
Knot sum	Definition	Manifolds and cell complexes
Conjugacy problem	Problem	Group theory and generalizations
Graph enumeration	Concept	Combinatorics
Relative homology	Concept	Algebraic topology
Horn	Definition	Algebraic topology
Localization	Concept	Commutative algebra
Regular semigroup	Definition	Group theory and generalizations
Pointless topology	Definition	Order, lattices, ordered algebraic structures
Quartic formula	Theorem	Field theory and polynomials
Ramanujan–Petersson conjecture	Theorem	Number theory
Teichmüller space	Definition	Functions of a complex variable
Reproducing kernel Hilbert space	Concept	Functional analysis
Galois group of a prime degree polynomial with two nonreal roots	Theorem	Field theory and polynomials
Growth rate of a group	Concept	Group theory and generalizations
g-theorem	Theorem	Convex and discrete geometry
Carathéodory's existence theorem	Theorem	Ordinary differential equations
Partial isometry	Definition	Operator theory
Minkowski question-mark function	Example	Real functions
Local cohomology	Definition	Commutative algebra
Normed algebra	Concept	Functional analysis
General recursive function	Definition	Mathematical logic and foundations
Operator system	Concept	Functional analysis
Net	Concept	General topology
Lagrange's theorem in S3	Example	Group theory and generalizations
Quillen's theorem on complex cobordism	Theorem	Algebraic topology
Semimartingale	Concept	Probability theory and stochastic processes
Weakly compact cardinal	Definition	Mathematical logic and foundations
Homotopy fiber	Concept	Algebraic topology
Resonance	Concept	Ordinary differential equations
Pringsheim convergence	Definition	Sequences, series, summability
Monomial ideal	Concept	Commutative algebra
Doob's martingale inequality	Theorem	Probability theory and stochastic processes
Brun sieve	Definition	Number theory
Homotopy fiber	Definition	Algebraic topology
Maass wave form	Definition	Number theory
Lamplighter group	Example	Group theory and generalizations
Ricci curvature	Concept	Differential geometry
Erdős distinct distances problem	Problem	Convex and discrete geometry
Realizability	Concept	Mathematical logic and foundations
Poisson manifold	Definition	Differential geometry
Determinacy	Definition	Mathematical logic and foundations
Fredholm alternative	Theorem	Linear and multilinear algebra; matrix theory
Max-flow min-cut theorem	Theorem	Combinatorics
WZ theory	Definition	Combinatorics
Feller process	Concept	Probability theory and stochastic processes
Fukaya category	Concept	Differential geometry
Random group	Concept	Group theory and generalizations
Mazur–Ulam theorem	Theorem	Functional analysis
Hilbert symbol	Definition	Number theory
Block design	Concept	Combinatorics
Discrete valuation ring	Definition	Commutative algebra
Eilenberg–Steenrod axioms	Definition	Algebraic topology
Character sum	Definition	Number theory
Kolmogorov quotient	Definition	General topology
Beltrami equation	Definition	Functions of a complex variable
Integral extension	Definition	Commutative algebra
Daniell integral	Concept	Measure and integration
1 + 2 + 3 + 4 + ⋯	Example	Sequences, series, summability
Spectrum of an element	Definition	Functional analysis
Barbalat's lemma	Lemma	Ordinary differential equations
Siegel's theorem on integral points	Theorem	Number theory
Seminorm	Definition	Functional analysis
Compactly generated space	Concept	General topology
Artin–Tate lemma	Lemma	Commutative algebra
Commuting probability	Concept	Group theory and generalizations
Exchangeable random variables	Concept	Probability theory and stochastic processes
Proof that subgroups of index two are normal	Proof	Group theory and generalizations
Sober space	Concept	General topology
Integro-differential equation	Definition	Integral equations
Nerve of a cover	Concept	Algebraic topology
Borel hierarchy	Concept	Mathematical logic and foundations
Ext functor	Concept	Commutative algebra
S-finite measure	Definition	Measure and integration
Weak homotopy equivalence	Concept	Algebraic topology
Percolation theory	Definition	Probability theory and stochastic processes
Axiom of constructibility	Concept	Mathematical logic and foundations
Bornological space	Concept	Functional analysis
Buchberger's algorithm	Concept	Commutative algebra
Fiber bundle	Definition	Algebraic topology
Eckmann–Hilton duality	Definition	Algebraic topology
Minkowski content	Definition	Measure and integration
Perfect set	Definition	General topology
The integers modulo the even integers	Example	Group theory and generalizations
Almost convergence	Definition	Sequences, series, summability
Jones polynomial	Concept	Manifolds and cell complexes
Nilpotency class	Concept	Group theory and generalizations
Portmanteau theorem	Theorem	Probability theory and stochastic processes
Limit point compact space	Definition	General topology
Loewner order	Definition	Linear and multilinear algebra; matrix theory
Feldman–Hájek theorem	Theorem	Measure and integration
Limit set	Definition	Dynamical systems and ergodic theory
Fractional calculus	Definition	Real functions
Field of rational functions	Concept	Field theory and polynomials
Rack and quandle	Definition	Manifolds and cell complexes
Grünwald–Letnikov derivative	Definition	Real functions
Nevanlinna–Pick interpolation	Theorem	Functions of a complex variable
Particular point topology	Example	General topology
Approximate derivative	Concept	Real functions
Log-normal distribution	Example	Probability theory and stochastic processes
Pi-system	Concept	Measure and integration
Matroid minor	Concept	Combinatorics
Dehn–Sommerville equations	Theorem	Convex and discrete geometry
Stieltjes function	Definition	Real functions
Nonexpansive map	Definition	Operator theory
Weak operator topology	Concept	Operator theory
Finite model theory	Concept	Mathematical logic and foundations
Poincaré–Hopf theorem	Theorem	Manifolds and cell complexes
Arithmetic group	Concept	Group theory and generalizations
Darboux integral	Definition	Real functions
Association scheme	Definition	Combinatorics
Approximately finite-dimensional C*-algebra	Concept	Functional analysis
Capacity of a set	Concept	Potential theory
Modular lambda function	Object	Number theory
Affine differential geometry	Definition	Differential geometry
Paris–Harrington theorem	Theorem	Mathematical logic and foundations
Thom space	Definition	Algebraic topology
Loewner differential equation	Concept	Functions of a complex variable
Selberg sieve	Concept	Number theory
Schauder basis	Concept	Functional analysis
Brownian bridge	Definition	Probability theory and stochastic processes
Analytic set	Definition	Mathematical logic and foundations
Intuitionistic logic	Definition	Mathematical logic and foundations
Stable homotopy theory	Concept	Algebraic topology
Monodromy theorem	Theorem	Functions of a complex variable