Every idea

Ideas 16351–16500 of 19838.

Name	Kind	Subject
Order of an entire function	Concept	Functions of a complex variable
Siegel zero	Definition	Number theory
Gumm terms	Concept	General algebraic systems
Combinatorial game theory	Concept	Game theory, economics, finance, and other social and behavioral sciences
Multiple comparisons problem	Problem	Statistics
Gelfand's trick	Proposition	Abstract harmonic analysis
Chain homotopy	Definition	Category theory; homological algebra
Julia set	Definition	Dynamical systems and ergodic theory
Linearity of the Laplace transform	Proposition	Integral transforms, operational calculus
Scale factor	Definition	Relativity and gravitational theory
Gravitational wave	Concept	Relativity and gravitational theory
Elliptic curve	Definition	Algebraic geometry
Homology sphere	Definition	Manifolds and cell complexes
f-vector	Definition	Convex and discrete geometry
Relative degree	Definition	Systems theory; control
Vlasov equation	Concept	Partial differential equations
Pierson–Moskowitz spectrum	Concept	Geophysics
Hamilton–Jacobi–Bellman equation	Concept	Calculus of variations and optimal control; optimization
Filtered back-projection	Concept	Integral transforms, operational calculus
Potential temperature	Concept	Geophysics
d'Alembert's functional equation	Definition	Difference and functional equations
CMB angular power spectrum	Concept	Astronomy and astrophysics
Krull's principal ideal theorem	Theorem	Commutative algebra
Weak solution	Concept	Partial differential equations
C*-algebra	Definition	Functional analysis
Homotopy type	Concept	Algebraic topology
Expectation value	Definition	Quantum theory
Monodromy	Definition	Ordinary differential equations
Tracy–Widom distribution	Definition	Probability theory and stochastic processes
Peak function	Concept	Several complex variables and analytic spaces
Quantum vortex	Definition	Fluid mechanics
Freudenthal triple system	Definition	Nonassociative rings and algebras
Martin boundary	Definition	Potential theory
Unilateral Z-transform	Definition	Integral transforms, operational calculus
K5 is not planar	Theorem	Combinatorics
Euler–Gauss limit formula	Theorem	Special functions
Hypoelliptic operator	Definition	Partial differential equations
Lefschetz principle	Theorem	Mathematical logic and foundations
Galactic coordinate system	Definition	Astronomy and astrophysics
Statically indeterminate structure	Concept	Mechanics of particles and systems
Quantum chromodynamics	Definition	Quantum theory
Hellinger distance	Concept	Statistics
Golay code	Object	Information and communication theory, circuits
Photonic crystal	Definition	Optics, electromagnetic theory
Kapitza's pendulum	Example	Mechanics of particles and systems
Hom functor	Definition	Category theory; homological algebra
Siciak extremal function	Definition	Several complex variables and analytic spaces
Indefinite sum	Concept	Difference and functional equations
Group algebra	Definition	Group theory and generalizations
Null-homotopic map	Concept	Algebraic topology
Tensor product of modules	Definition	Commutative algebra
Comparability graph	Definition	Combinatorics
Grothendieck universe	Concept	Mathematical logic and foundations
Love wave	Definition	Mechanics of deformable solids
Optical soliton	Definition	Optics, electromagnetic theory
Speed of sound	Concept	Fluid mechanics
Prandtl boundary layer equations	Definition	Fluid mechanics
Tensor rank	Definition	Linear and multilinear algebra; matrix theory
Left-invariant vector field	Concept	Topological groups, Lie groups
Zamolodchikov c-theorem	Theorem	Quantum theory
Work–energy theorem	Theorem	Mechanics of particles and systems
Laplace's equation	Definition	Partial differential equations
Delta derivative on a time scale	Definition	Real functions
Expectation–maximization algorithm	Definition	Statistics
Volterra equation of convolution type	Concept	Integral equations
Generalized Fourier series	Concept	Harmonic analysis on Euclidean spaces
Kadison–Kaplansky conjecture	Conjecture	Functional analysis
Order of a difference equation	Concept	Difference and functional equations
Fracture mechanics	Concept	Mechanics of deformable solids
Whitney immersion theorem	Theorem	Manifolds and cell complexes
Wang's finiteness theorem	Theorem	Topological groups, Lie groups
Delay differential equation	Definition	Ordinary differential equations
Geostrophic balance	Definition	Fluid mechanics
Hasse principle	Definition	Number theory
Assembly map	Definition	K-theory
Stellar dynamics	Definition	Astronomy and astrophysics
Non-Euclidean geometry	Concept	Geometry
Golden rule savings rate	Proposition	Game theory, economics, finance, and other social and behavioral sciences
Quantum complexity class BQP	Definition	Computer science
Segre's theorem	Theorem	Geometry
Bondareva–Shapley theorem	Theorem	Game theory, economics, finance, and other social and behavioral sciences
Bimetric gravity	Definition	Relativity and gravitational theory
Carleman's singular integral equation	Example	Integral equations
Entropy	Concept	Classical thermodynamics, heat transfer
Partial trace	Concept	Quantum theory
Critical exponent	Concept	Statistical mechanics, structure of matter
Topological group structure of a vector space	Concept	Functional analysis
Energy cascade	Definition	Fluid mechanics
Spherical geometry	Concept	Geometry
Auslander–Buchsbaum formula	Theorem	Commutative algebra
Conformal bootstrap	Concept	Quantum theory
Remez algorithm	Definition	Numerical analysis
Carleson measure	Concept	Functions of a complex variable
Hadamard product	Concept	Linear and multilinear algebra; matrix theory
Gaussian curvature	Concept	Differential geometry
Boolean circuit	Concept	Computer science
Wright–Fisher model	Concept	Biology and other natural sciences
Abelian extension	Definition	Field theory and polynomials
Ultrafilter	Definition	General topology
Hotelling's T-squared distribution	Definition	Statistics
Functional equation	Concept	Difference and functional equations
f(R) gravity	Definition	Relativity and gravitational theory
Weak homotopy equivalence	Definition	Algebraic topology
Sommerfeld's half-plane diffraction problem	Problem	Optics, electromagnetic theory
Heaviside cover-up method	Concept	Real functions
String diagram	Definition	Category theory; homological algebra
Braid group	Definition	Group theory and generalizations
Equioscillation theorem	Theorem	Approximations and expansions
Convergence of Fourier series	Definition	Harmonic analysis on Euclidean spaces
Polynomial interpolation	Concept	Approximations and expansions
Rigid body dynamics	Definition	Mechanics of particles and systems
Bäcklund transform	Concept	Dynamical systems and ergodic theory
Beth number	Concept	Mathematical logic and foundations
Complete set of orthogonal idempotents	Concept	Associative rings and algebras
Quadratic residue code	Concept	Information and communication theory, circuits
Magnetic dipole moment	Concept	Optics, electromagnetic theory
Seeley–DeWitt coefficients	Definition	Global analysis, analysis on manifolds
Pitman–Koopman–Darmois theorem	Theorem	Statistics
Inner regular measure	Definition	Measure and integration
Rental harmony	Theorem	Game theory, economics, finance, and other social and behavioral sciences
Hausdorff dimension	Concept	Measure and integration
Monomorphism	Definition	Category theory; homological algebra
Coleman–Noll procedure	Concept	Mechanics of deformable solids
Whitney's theorem on folds and cusps	Theorem	Manifolds and cell complexes
Initial value problem for a recurrence	Concept	Difference and functional equations
Elliptic boundary value problem	Definition	Partial differential equations
Belousov–Zhabotinsky reaction	Example	Biology and other natural sciences
Arctic circle theorem	Theorem	Statistical mechanics, structure of matter
Separation of variables in the Hamilton–Jacobi equation	Concept	Mechanics of particles and systems
Betti number	Concept	Algebraic topology
Connective constant	Definition	Statistical mechanics, structure of matter
Tight frame	Definition	Harmonic analysis on Euclidean spaces
Milloux problem	Problem	Potential theory
Poisson regression	Concept	Statistics
Cauchy's power equation	Definition	Difference and functional equations
Wiener's criterion	Theorem	Potential theory
Ward–Takahashi identity	Theorem	Quantum theory
Boolean prime ideal theorem	Theorem	Mathematical logic and foundations
Entropy production	Concept	Statistical mechanics, structure of matter
Krull dimension of a poset	Definition	Order, lattices, ordered algebraic structures
Inductive dimension	Definition	General topology
Parastatistics	Definition	Quantum theory
Calabi–Yau manifold	Concept	Algebraic geometry
Moise's theorem	Theorem	Manifolds and cell complexes
Surface of general type	Concept	Algebraic geometry
Cusp form	Definition	Number theory
McKendrick–von Foerster equation	Concept	Biology and other natural sciences
Holling functional response	Definition	Biology and other natural sciences
Fell topology	Concept	Topological groups, Lie groups
Lelong class	Definition	Several complex variables and analytic spaces