Every idea

Ideas 3751–3900 of 7806.

Name	Kind	Subject
von Neumann bounded set	Concept	Functional analysis
Twelvefold way	Definition	Combinatorics
Discriminant of a field extension	Concept	Number theory
Urysohn space	Definition	General topology
Priority method	Concept	Mathematical logic and foundations
Lagrange's theorem	Theorem	Group theory and generalizations
Automorphic form	Concept	Number theory
Strassen algorithm	Concept	Numerical analysis
Nilradical is the intersection of the prime ideals	Theorem	Commutative algebra
Gelfand–Mazur theorem	Theorem	Functional analysis
Doléans-Dade exponential	Concept	Probability theory and stochastic processes
Joukowsky transform	Example	Functions of a complex variable
Knaster–Kuratowski fan	Counterexample	General topology
Dirac operator	Concept	Global analysis, analysis on manifolds
Fejér kernel	Definition	Harmonic analysis on Euclidean spaces
Multivariate formal power series	Concept	Commutative algebra
Regular measure	Definition	Measure and integration
Finitely presented module	Concept	Commutative algebra
Lakes of Wada	Example	General topology
Vector fields on spheres	Theorem	Manifolds and cell complexes
Ending lamination theorem	Theorem	Manifolds and cell complexes
Nuclear operator	Definition	Operator theory
Quaternionic analysis	Definition	Functions of a complex variable
Periodic boundary conditions	Concept	Ordinary differential equations
Toeplitz matrix	Definition	Linear and multilinear algebra; matrix theory
Fréchet space	Concept	Functional analysis
Schwarzian derivative	Definition	Functions of a complex variable
Standard probability space	Definition	Measure and integration
Löb's theorem	Theorem	Mathematical logic and foundations
Weeks manifold	Example	Manifolds and cell complexes
Cramér–Wold theorem	Theorem	Probability theory and stochastic processes
Derivation	Concept	Commutative algebra
Complex cobordism	Definition	Algebraic topology
Filter limit	Definition	General topology
Square root of a positive operator	Concept	Operator theory
Robinson arithmetic	Concept	Mathematical logic and foundations
Moving frame	Concept	Differential geometry
Gelfand's formula	Theorem	Linear and multilinear algebra; matrix theory
Birkhoff–von Neumann theorem	Theorem	Linear and multilinear algebra; matrix theory
Inverse semigroup	Concept	Group theory and generalizations
Brownian bridge	Concept	Probability theory and stochastic processes
Extreme point	Concept	Functional analysis
Pushforward measure	Concept	Measure and integration
Forcing	Definition	Mathematical logic and foundations
Complemented subspace	Definition	Functional analysis
Brouwer's characterization of the Cantor space	Theorem	General topology
Additive combinatorics	Concept	Number theory
Eisenstein series	Definition	Number theory
Homogeneous ideal	Definition	Commutative algebra
Spectral radius	Definition	Linear and multilinear algebra; matrix theory
Diagonal lemma	Lemma	Mathematical logic and foundations
Boolean model	Definition	Probability theory and stochastic processes
Thue equation	Concept	Number theory
Sullivan minimal model	Concept	Algebraic topology
Wigner semicircle law	Theorem	Probability theory and stochastic processes
Bendixson–Dulac theorem	Theorem	Ordinary differential equations
Poincaré conjecture	Theorem	Manifolds and cell complexes
Transfer homomorphism	Concept	Group theory and generalizations
Maass wave form	Concept	Number theory
Graph of an operator	Concept	Operator theory
Hurwitz's theorem (number theory)	Theorem	Number theory
Michael selection theorem	Theorem	General topology
Daniell integral	Definition	Measure and integration
Transfer principle	Theorem	Mathematical logic and foundations
Analytic set	Concept	Mathematical logic and foundations
Local property	Concept	Commutative algebra
Nagata ring	Concept	Commutative algebra
Dissipative operator	Concept	Operator theory
Toeplitz algebra	Object	Operator theory
Exponential of a bounded operator	Definition	Operator theory
Von Neumann universe	Object	Mathematical logic and foundations
Metric outer measure	Concept	Measure and integration
Commutant lifting theorem	Theorem	Operator theory
Closable operator	Concept	Operator theory
Hermite–Hadamard inequality	Theorem	Real functions
Toeplitz operator	Definition	Operator theory
Sphere bundle	Concept	Algebraic topology
Schoenflies theorem	Theorem	Manifolds and cell complexes
Tarski–Seidenberg theorem	Theorem	Algebraic geometry
Krohn–Rhodes theory	Concept	Group theory and generalizations
Type and cotype	Definition	Functional analysis
Ten martini problem	Problem	Operator theory
Doubly stochastic matrix	Definition	Linear and multilinear algebra; matrix theory
Covering space	Concept	Manifolds and cell complexes
Excellent ring	Definition	Commutative algebra
Hyperkähler manifold	Definition	Differential geometry
Method of multiple scales	Definition	Ordinary differential equations
Wiener–Khinchin theorem	Theorem	Probability theory and stochastic processes
Bloch space	Definition	Functions of a complex variable
Ahlswede–Daykin inequality	Theorem	Combinatorics
Hilbert dimension	Concept	Functional analysis
Schwarz–Christoffel mapping	Definition	Functions of a complex variable
Mapping class group	Definition	Manifolds and cell complexes
Perfect set property	Definition	Mathematical logic and foundations
Einstein manifold	Concept	Differential geometry
Minimal surface	Concept	Differential geometry
Hyperreal number	Concept	Real functions
Elliptic curve	Concept	Algebraic geometry
Cartan–Hadamard theorem	Theorem	Differential geometry
Baumslag–Solitar group	Example	Group theory and generalizations
Type theory	Definition	Mathematical logic and foundations
Radical of an ideal	Concept	Commutative algebra
Schur polynomial	Concept	Combinatorics
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