Every idea

Ideas 14101–14167 of 14167.

Name	Kind	Subject
Hindman's theorem	Theorem	Combinatorics
Mellin transform as a Fourier transform in logarithmic variables	Proposition	Integral transforms, operational calculus
Artinian ring	Definition	Commutative algebra
Partially well-ordered set	Definition	Order, lattices, ordered algebraic structures
Stone space	Concept	Order, lattices, ordered algebraic structures
Kernel density estimation	Concept	Statistics
Grothendieck spectral sequence	Theorem	Category theory; homological algebra
Open immersion	Definition	Algebraic geometry
Bilinear interpolation	Definition	Numerical analysis
Montel's theorem	Theorem	Functions of a complex variable
Topology generated by a family of seminorms	Concept	Functional analysis
Numerical linear algebra	Definition	Numerical analysis
Quiver	Definition	Associative rings and algebras
Essential supremum	Definition	Measure and integration
Arnold diffusion	Concept	Dynamical systems and ergodic theory
Partial difference equation	Definition	Difference and functional equations
Kodaira dimension	Concept	Algebraic geometry
Langevin equation	Concept	Probability theory and stochastic processes
Injective resolution	Concept	Category theory; homological algebra
Sigma-compact space	Concept	General topology
Regular and singular points of an analytic set	Concept	Several complex variables and analytic spaces
Statistical convergence	Concept	Sequences, series, summability
Birch and Swinnerton-Dyer conjecture	Conjecture	Number theory
Local martingale	Definition	Probability theory and stochastic processes
Mason–Stothers theorem	Theorem	Number theory
Brachistochrone problem	Problem	Calculus of variations and optimal control; optimization
Weak Nullstellensatz	Theorem	Commutative algebra
Newton–Puiseux theorem	Theorem	Commutative algebra
Quaternion algebra	Concept	Associative rings and algebras
A priori estimate	Definition	Partial differential equations
Proof of the cancellation laws	Proof	Group theory and generalizations
Completion of a measure	Definition	Measure and integration
Hellinger–Toeplitz theorem	Theorem	Operator theory
Disjoint union topology	Concept	General topology
Absolute continuity of the Lebesgue integral	Proposition	Measure and integration
Reduced scheme	Concept	Algebraic geometry
Divisible group	Concept	Group theory and generalizations
Maupertuis's principle	Theorem	Mechanics of particles and systems
Transitivity of integrality	Proposition	Commutative algebra
Bäcklund transform	Definition	Dynamical systems and ergodic theory
Riemann solver	Concept	Numerical analysis
Euler–Lagrange equation	Definition	Calculus of variations and optimal control; optimization
Category of small categories	Example	Category theory; homological algebra
Fundamental solution	Definition	Partial differential equations
Whitehead tower	Definition	Algebraic topology
Boundary integral equation for the Dirichlet problem	Theorem	Potential theory
Riesz basis	Concept	Harmonic analysis on Euclidean spaces
Levitzki radical	Definition	Associative rings and algebras
Discrete valuation	Definition	Field theory and polynomials
Invariant mean	Concept	Abstract harmonic analysis
Height of a poset	Definition	Order, lattices, ordered algebraic structures
Degree of exactness of a quadrature rule	Concept	Numerical analysis
Thom–Boardman singularities	Definition	Manifolds and cell complexes
Pariah groups	Concept	Group theory and generalizations
hp-FEM	Concept	Numerical analysis
Elliptic gamma function	Definition	Special functions
Lane–Emden equation	Definition	Partial differential equations
Residue calculus for Laplace inversion	Definition	Integral transforms, operational calculus
Free magma	Example	General algebraic systems
Orderable group	Definition	Group theory and generalizations
Inverse mean curvature flow	Definition	Differential geometry
Teichmüller space	Concept	Functions of a complex variable
Continuous multiplication	Concept	Topological groups, Lie groups
Étale cohomology	Definition	Algebraic geometry
Stein–Tomas restriction theorem	Theorem	Harmonic analysis on Euclidean spaces
Obstruction theory	Concept	Algebraic topology
Heisenberg group	Example	Topological groups, Lie groups