Concepts

A mathematical idea. It can have more than one definition.

Ideas 2101–2250 of 2778.

Name	Kind	Subject
Kauffman bracket	Concept	Manifolds and cell complexes
Infinite product	Concept	Sequences, series, summability
Torsion tensor	Concept	Differential geometry
Torsion group	Concept	Group theory and generalizations
Baire function	Concept	Real functions
Sublinear function	Concept	Functional analysis
Van Wijngaarden transformation	Concept	Numerical analysis
Hyperbolic knot	Concept	Manifolds and cell complexes
Affine differential geometry	Concept	Differential geometry
Spectral theory	Concept	Operator theory
Total ring of fractions	Concept	Commutative algebra
Fixed-point iteration	Concept	Operator theory
Seifert surface	Concept	Manifolds and cell complexes
Cohomology operation	Concept	Algebraic topology
Profinite group	Concept	Group theory and generalizations
Ordinal arithmetic	Concept	Mathematical logic and foundations
Sheaf cohomology in topology	Concept	Algebraic topology
Completion of a ring	Concept	Commutative algebra
Hilbert C*-module	Concept	Functional analysis
VC dimension	Concept	Combinatorics
C* identity	Concept	Functional analysis
Isomonodromic deformation	Concept	Ordinary differential equations
Witt group	Concept	Number theory
Finitely additive measure	Concept	Measure and integration
Transcritical bifurcation	Concept	Ordinary differential equations
Outer function	Concept	Functions of a complex variable
Curve complex	Concept	Manifolds and cell complexes
Strong operator topology	Concept	Operator theory
Tight closure	Concept	Commutative algebra
Completion of a measure	Concept	Measure and integration
Tricolorability	Concept	Manifolds and cell complexes
Differentially closed field	Concept	Field theory and polynomials
Morse function	Concept	Manifolds and cell complexes
Hall subgroup	Concept	Group theory and generalizations
Matrix pencil	Concept	Linear and multilinear algebra; matrix theory
Kolmogorov backward equation	Concept	Probability theory and stochastic processes
Normal ring	Concept	Commutative algebra
Unbounded operator	Concept	Operator theory
Field norm	Concept	Field theory and polynomials
Class number	Concept	Number theory
Algebraic independence	Concept	Field theory and polynomials
Algorithmic randomness	Concept	Mathematical logic and foundations
Ring of sets	Concept	Measure and integration
Dirichlet space	Concept	Functions of a complex variable
Exponential of a bounded operator	Concept	Operator theory
Frattini subgroup	Concept	Group theory and generalizations
Dedekind zeta function	Concept	Number theory
Quillen equivalence	Concept	Category theory; homological algebra
Harmonic map	Concept	Global analysis, analysis on manifolds
Computable function	Concept	Mathematical logic and foundations
Perron integral	Concept	Real functions
Singular homology	Concept	Algebraic topology
Compact operator	Concept	Operator theory
Depth	Concept	Commutative algebra
Green's function for the Laplacian	Concept	Potential theory
Nevanlinna class	Concept	Functions of a complex variable
Brun sieve	Concept	Number theory
Ideal norm	Concept	Number theory
Local coefficient system	Concept	Algebraic topology
Hölder summation	Concept	Sequences, series, summability
Matrix summability method	Concept	Sequences, series, summability
Analytical hierarchy	Concept	Mathematical logic and foundations
Character space	Concept	Functional analysis
Ahlfors theory	Concept	Functions of a complex variable
Sylvester equation	Concept	Linear and multilinear algebra; matrix theory
Grünwald–Letnikov derivative	Concept	Real functions
First fundamental form	Concept	Differential geometry
Saddle-node bifurcation	Concept	Ordinary differential equations
Additive energy	Concept	Number theory
Lyapunov–Schmidt reduction	Concept	Operator theory
Hamiltonian path	Concept	Combinatorics
Weak convergence of measures	Concept	Probability theory and stochastic processes
Local homeomorphism	Concept	General topology
Urysohn space	Concept	General topology
Group extension	Concept	Group theory and generalizations
Gödel numbering	Concept	Mathematical logic and foundations
Regular variation	Concept	Real functions
Difference set	Concept	Combinatorics
Space of bounded continuous functions	Concept	Functional analysis
Alexander–Spanier cohomology	Concept	Algebraic topology
Discrete valuation ring	Concept	Commutative algebra
Surgery theory	Concept	Manifolds and cell complexes
Bochner integral	Concept	Measure and integration
Kolmogorov quotient	Concept	General topology
Metropolis–Hastings algorithm	Concept	Numerical analysis
Inductive dimension	Concept	General topology
Unitary operator	Concept	Operator theory
Linear continuum	Concept	General topology
Tightness of measures	Concept	Probability theory and stochastic processes
Group algebra	Concept	Group theory and generalizations
Percolation threshold	Concept	Probability theory and stochastic processes
Projective dimension	Concept	Commutative algebra
Willmore flow	Concept	Differential geometry
Mittag-Leffler summation	Concept	Sequences, series, summability
Model theory of algebraically closed fields	Concept	Field theory and polynomials
Model	Concept	Mathematical logic and foundations
Krull dimension	Concept	Commutative algebra
Algebraic number field	Concept	Number theory
Dedekind eta function	Concept	Number theory
Anderson localization	Concept	Statistical mechanics, structure of matter
Dowker space	Concept	General topology
Local ring	Concept	Commutative algebra
Operator monotone function	Concept	Operator theory
Large sieve	Concept	Number theory
Cohen–Macaulay ring	Concept	Commutative algebra
Fitting subgroup	Concept	Group theory and generalizations
Varifold	Concept	Calculus of variations and optimal control; optimization
Approximate point spectrum	Concept	Operator theory
Pseudoholomorphic curve	Concept	Several complex variables and analytic spaces
Proof theory	Concept	Mathematical logic and foundations
Measurable space	Concept	Measure and integration
Space of functions vanishing at infinity	Concept	Functional analysis
Liouvillian function	Concept	Field theory and polynomials
Adjunction space	Concept	General topology
Basic open set	Concept	Algebraic geometry
Perfect map	Concept	General topology
Linearly disjoint extensions	Concept	Field theory and polynomials
Linear and stable summation methods	Concept	Sequences, series, summability
Cap product	Concept	Algebraic topology
Cesàro summation	Concept	Sequences, series, summability
Heteroclinic orbit	Concept	Ordinary differential equations
Positive element	Concept	Functional analysis
Quaternion-Kähler manifold	Concept	Differential geometry
Tomita–Takesaki theory	Concept	Functional analysis
Floer homology	Concept	Differential geometry
Hyperfunction	Concept	Functional analysis
Krein space	Concept	Functional analysis
Axiom of regularity	Concept	Mathematical logic and foundations
Stopped process	Concept	Probability theory and stochastic processes
Heyting algebra	Concept	Order, lattices, ordered algebraic structures
Kripke semantics	Concept	Mathematical logic and foundations
Pfaffian	Concept	Linear and multilinear algebra; matrix theory
Partition of unity	Concept	Global analysis, analysis on manifolds
Lyapunov exponent	Concept	Ordinary differential equations
Connection on a principal bundle	Concept	Differential geometry
Residue field	Concept	Commutative algebra
Genus	Concept	Manifolds and cell complexes
Continuum	Concept	General topology
Reduced homology	Concept	Algebraic topology
Boolean model	Concept	Probability theory and stochastic processes
Moduli of algebraic curves	Concept	Algebraic geometry
Absorbing set	Concept	Functional analysis
Cyclotomic field	Concept	Number theory
Reflexive space	Concept	Functional analysis
Inner function	Concept	Functions of a complex variable
Resultant	Concept	Commutative algebra
Group of Lie type	Concept	Group theory and generalizations
Conway polynomial	Concept	Number theory
Hyperarithmetical theory	Concept	Mathematical logic and foundations
Torus knot	Concept	Manifolds and cell complexes