Every idea

Ideas 17551–17700 of 19875.

Name	Kind	Subject
Slice theorem	Theorem	Manifolds and cell complexes
Coherence	Concept	Optics, electromagnetic theory
Abelian Lie algebra	Definition	Nonassociative rings and algebras
Twenty-seven lines on a cubic surface	Theorem	Algebraic geometry
Heat	Definition	Classical thermodynamics, heat transfer
Chow–Rashevskii theorem	Theorem	Systems theory; control
Null set	Concept	Measure and integration
Kolmogorov–Arnold representation theorem	Theorem	Real functions
Hebbian learning	Concept	Biology and other natural sciences
Rheonomous constraint	Concept	Mechanics of particles and systems
Steenrod square	Concept	Algebraic topology
Eigenvalue perturbation	Concept	Linear and multilinear algebra; matrix theory
Operator Cauchy equation and one-parameter semigroups	Theorem	Operator theory
Lie pseudogroup	Definition	Global analysis, analysis on manifolds
Askey scheme	Definition	Special functions
Geothermal gradient	Definition	Geophysics
Periodic solution	Definition	Ordinary differential equations
Uniform integrability	Concept	Measure and integration
Isentropic process	Definition	Classical thermodynamics, heat transfer
L	Concept	Computer science
Sheaf cohomology in topology	Definition	Algebraic topology
Biot consolidation theory	Definition	Mechanics of deformable solids
Complete elliptic integral of the second kind	Concept	Special functions
Perihelion precession of Mercury	Proposition	Relativity and gravitational theory
Effective medium approximations	Concept	Mechanics of deformable solids
Elliptic surface	Concept	Algebraic geometry
Modified Bessel functions	Definition	Special functions
Totally unimodular matrix	Concept	Linear and multilinear algebra; matrix theory
Transfinite diameter	Concept	Potential theory
Interval order	Concept	Order, lattices, ordered algebraic structures
Hodograph transformation	Definition	Fluid mechanics
Supergravity	Definition	Relativity and gravitational theory
Numerical differentiation	Definition	Numerical analysis
Choked flow	Definition	Fluid mechanics
Sine and cosine addition equations	Definition	Difference and functional equations
Polish space	Definition	General topology
Entourage	Definition	General topology
Jónsson's lemma	Theorem	General algebraic systems
Braided monoidal category	Concept	Category theory; homological algebra
Evanescent field	Concept	Optics, electromagnetic theory
Grunsky matrix	Definition	Functions of a complex variable
Normalization	Definition	Algebraic geometry
Cantor algebra	Example	Order, lattices, ordered algebraic structures
Chemical master equation	Concept	Probability theory and stochastic processes
Tensor algebra	Definition	Linear and multilinear algebra; matrix theory
Isolated hypersurface singularity	Concept	Several complex variables and analytic spaces
Schröder's equation	Concept	Difference and functional equations
PSPACE-completeness	Definition	Computer science
Kodaira–Nirenberg–Spencer existence theorem	Theorem	Several complex variables and analytic spaces
Braess's paradox	Counterexample	Operations research, mathematical programming
Limit	Definition	Category theory; homological algebra
Character sum	Concept	Number theory
Empirical process	Definition	Probability theory and stochastic processes
Monster Lie algebra	Object	Nonassociative rings and algebras
Compatibility conditions	Theorem	Mechanics of deformable solids
Computational electromagnetics	Definition	Partial differential equations
Sequence alignment	Definition	Biology and other natural sciences
Grashof number	Concept	Fluid mechanics
Lp spaces on groups	Concept	Abstract harmonic analysis
q-binomial theorem	Theorem	Special functions
Tricomi confluent hypergeometric function	Definition	Special functions
Amitsur's theorem on the radical of polynomial rings	Theorem	Associative rings and algebras
Supergravity	Concept	Relativity and gravitational theory
Perfect field	Concept	Field theory and polynomials
Min-entropy	Definition	Information and communication theory, circuits
Exponential type	Definition	Functions of a complex variable
Convenient vector space	Definition	Functional analysis
Binomial proportion confidence interval	Definition	Statistics
Gelfand transform	Concept	Functional analysis
Kozai mechanism	Concept	Mechanics of particles and systems
Routh's theorem	Theorem	Geometry
Holonomy	Definition	Differential geometry
Tensor decomposition	Concept	Linear and multilinear algebra; matrix theory
Lapse rate	Definition	Geophysics
Comma category	Definition	Category theory; homological algebra
Hardy–Littlewood maximal function	Concept	Harmonic analysis on Euclidean spaces
CMB angular power spectrum	Definition	Astronomy and astrophysics
Interpolation space	Concept	Functional analysis
Canonical anticommutation relations	Definition	Quantum theory
Strong operator topology	Definition	Operator theory
Kigami's construction of Laplacians on post-critically finite fractals	Theorem	Potential theory
General covariance	Definition	Relativity and gravitational theory
Yang–Mills existence and mass gap	Problem	Quantum theory
Hamiltonian operator	Concept	Quantum theory
Exact couple	Concept	Algebraic topology
Murray's law	Proposition	Fluid mechanics
Initial mass function	Definition	Astronomy and astrophysics
Structure formation	Concept	Astronomy and astrophysics
Baskakov operator	Concept	Approximations and expansions
Unknotting problem	Problem	Manifolds and cell complexes
Cremona diagram	Definition	Mechanics of particles and systems
Ideal gas law	Fact	Classical thermodynamics, heat transfer
Stable distribution	Definition	Probability theory and stochastic processes
Haar measure	Concept	Measure and integration
Exponential stability	Concept	Ordinary differential equations
Spherical code	Definition	Convex and discrete geometry
Turbulence	Concept	Fluid mechanics
Lax–Friedrichs method	Concept	Numerical analysis
Muller's ratchet	Concept	Biology and other natural sciences
Boolean algebras canonically defined	Concept	Order, lattices, ordered algebraic structures
Basic reproduction number	Concept	Biology and other natural sciences
Electrohydrodynamics	Definition	Fluid mechanics
Synthetic geometry	Concept	Geometry
Stackelberg competition	Definition	Game theory, economics, finance, and other social and behavioral sciences
Wilson–Cowan neural field equation	Example	Biology and other natural sciences
Vector quantization	Definition	Information and communication theory, circuits
Structured singular value	Definition	Systems theory; control
CUSUM	Definition	Statistics
G-structure	Concept	Differential geometry
Hausdorff dimension	Definition	Measure and integration
Macdonald polynomial	Concept	Combinatorics
Graph minor	Concept	Combinatorics
Function field of a variety	Definition	Algebraic geometry
Z-channel	Example	Information and communication theory, circuits
Trefoil knot	Example	Manifolds and cell complexes
Fresnel number	Definition	Optics, electromagnetic theory
Transfer homomorphism	Definition	Group theory and generalizations
Akra–Bazzi theorem	Theorem	Computer science
Herbrand's theorem	Theorem	Mathematical logic and foundations
Whittaker transform	Concept	Integral transforms, operational calculus
Pseudoanalytic function	Definition	Functions of a complex variable
Supersymmetry	Definition	Quantum theory
Controllable canonical form	Concept	Systems theory; control
Ehresmann connection	Definition	Differential geometry
Coulomb gas method	Definition	Statistical mechanics, structure of matter
Massive gravity	Definition	Relativity and gravitational theory
Medial magma	Concept	Group theory and generalizations
Boolean product	Definition	General algebraic systems
Graetz problem	Problem	Classical thermodynamics, heat transfer
Cascade algorithm	Concept	Numerical analysis
Abrikosov vortex lattice	Object	Statistical mechanics, structure of matter
Uniqueness theorem for Fourier–Stieltjes transforms	Theorem	Abstract harmonic analysis
Mechanical similarity	Concept	Mechanics of particles and systems
Germ	Concept	General topology
Dijkstra's algorithm	Concept	Combinatorics
Quasi-compact morphism	Definition	Algebraic geometry
Lévy's upward theorem	Theorem	Probability theory and stochastic processes
Theory of computation	Concept	Computer science
Quantum field theory	Concept	Quantum theory
Law of corresponding states	Proposition	Classical thermodynamics, heat transfer
Canonical bundle	Concept	Algebraic geometry
Well-posed problem	Concept	Partial differential equations
Universally closed morphism	Concept	Algebraic geometry
Whittle likelihood	Concept	Statistics
Helmholtz equation	Definition	Partial differential equations
Quine–McCluskey algorithm	Concept	Information and communication theory, circuits
Projective subspace	Definition	Geometry
Toyoda–Bruck theorem	Theorem	Group theory and generalizations
Quartic reciprocity	Theorem	Number theory
Schwarz's list	Theorem	Special functions