Every idea

Ideas 16201–16350 of 19934.

Name	Kind	Subject
Submanifold	Definition	Global analysis, analysis on manifolds
Thermodynamic square	Concept	Classical thermodynamics, heat transfer
Comonad	Definition	Category theory; homological algebra
Levi-flat hypersurface	Concept	Several complex variables and analytic spaces
Tsirelson space	Example	Functional analysis
Torsion of a curve	Concept	Differential geometry
Ambient noise seismic interferometry	Concept	Geophysics
Bol loop	Concept	Group theory and generalizations
Radical ideal	Concept	Commutative algebra
Continuum mechanics	Definition	Mechanics of deformable solids
Silverman–Toeplitz theorem	Theorem	Sequences, series, summability
Semantic security	Definition	Information and communication theory, circuits
Stone's representation theorem for Boolean algebras	Theorem	Order, lattices, ordered algebraic structures
Quasiconvex function	Concept	Real functions
Hecke operator	Concept	Number theory
Time-variant system	Concept	Systems theory; control
Rankine–Hugoniot conditions	Theorem	Partial differential equations
Cryptographic hash function	Definition	Information and communication theory, circuits
Product	Concept	Category theory; homological algebra
Edwards–Anderson model	Example	Statistical mechanics, structure of matter
Hochschild homology	Concept	Associative rings and algebras
Cournot competition	Concept	Game theory, economics, finance, and other social and behavioral sciences
Period-doubling bifurcation	Definition	Dynamical systems and ergodic theory
Tolman surface brightness test	Theorem	Astronomy and astrophysics
Double-couple source	Concept	Geophysics
Haar measure on a Lie group	Definition	Topological groups, Lie groups
Group of Lie type	Definition	Group theory and generalizations
Error exponent	Concept	Information and communication theory, circuits
Barnes–Hut simulation	Definition	Astronomy and astrophysics
Fox H-function transforms	Concept	Integral transforms, operational calculus
Orthogonality of characters	Theorem	Abstract harmonic analysis
Skew polynomial ring	Concept	Associative rings and algebras
Fiber product of schemes	Definition	Algebraic geometry
Shanks transformation	Definition	Numerical analysis
Relaxation of a variational problem	Definition	Calculus of variations and optimal control; optimization
Shapley–Shubik power index	Definition	Game theory, economics, finance, and other social and behavioral sciences
Unique factorization of ideals in a Dedekind domain	Theorem	Commutative algebra
Survival analysis	Definition	Statistics
Multiplicative decomposition of the deformation gradient	Concept	Mechanics of deformable solids
Thermal radiation	Concept	Classical thermodynamics, heat transfer
Arithmetic progression	Example	Number theory
Electroactive polymer	Concept	Mechanics of deformable solids
Hardy's inequality	Theorem	Real functions
Revenue equivalence theorem	Theorem	Game theory, economics, finance, and other social and behavioral sciences
Bidiagonalization	Theorem	Numerical analysis
Class operators H S P	Concept	General algebraic systems
Shannon capacity of a graph	Concept	Combinatorics
K-epsilon turbulence model	Concept	Fluid mechanics
Schechter luminosity function	Definition	Astronomy and astrophysics
Green's relations	Concept	Group theory and generalizations
Heat engine	Concept	Classical thermodynamics, heat transfer
Operator space	Definition	Operator theory
Lovász extension	Definition	Operations research, mathematical programming
Quantum circuit	Concept	Quantum theory
Supersymmetry	Concept	Quantum theory
BRST quantization	Definition	Quantum theory
Riccati difference equation	Definition	Difference and functional equations
Frank-Kamenetskii theory of thermal explosion	Concept	Classical thermodynamics, heat transfer
Toda bracket	Definition	Algebraic topology
Incidence structure	Definition	Geometry
Principal symbol of an operator on a manifold	Concept	Global analysis, analysis on manifolds
Bernstein algebra	Concept	Nonassociative rings and algebras
Thermodynamic work	Concept	Classical thermodynamics, heat transfer
Båth's law	Fact	Geophysics
Pareto front	Definition	Operations research, mathematical programming
Laplace's equation	Concept	Partial differential equations
Four-vector	Concept	Relativity and gravitational theory
Brown–Peterson cohomology	Concept	Algebraic topology
Persistent homology	Concept	Algebraic topology
Foliation	Definition	Manifolds and cell complexes
Selberg integral	Theorem	Special functions
Prime model	Concept	Mathematical logic and foundations
Chebyshev's sum inequality	Theorem	Real functions
Divisible group	Definition	Group theory and generalizations
Bethe ansatz	Concept	Statistical mechanics, structure of matter
Vis-viva equation	Proposition	Mechanics of particles and systems
Fatou's lemma	Lemma	Measure and integration
Fast Fourier transform	Theorem	Numerical analysis
Mean free path	Definition	Statistical mechanics, structure of matter
Wave equation	Definition	Partial differential equations
Conjugate prior	Definition	Statistics
Muckenhoupt's theorem	Theorem	Harmonic analysis on Euclidean spaces
Smoothed-particle hydrodynamics	Concept	Fluid mechanics
Kleene's T predicate	Concept	Mathematical logic and foundations
Category of elements	Concept	Category theory; homological algebra
Boussinesq eddy viscosity hypothesis	Definition	Fluid mechanics
Lambek's lemma	Lemma	Category theory; homological algebra
Backtracking line search	Definition	Operations research, mathematical programming
Herglotz–Riesz kernel	Definition	Potential theory
Primitive equations	Definition	Geophysics
Henyey track	Concept	Astronomy and astrophysics
Kummer's transformation	Theorem	Special functions
Residuated lattice	Definition	Order, lattices, ordered algebraic structures
Genetic algebra	Concept	Nonassociative rings and algebras
Priestley duality	Theorem	Order, lattices, ordered algebraic structures
Proof that cyclic groups of the same order are isomorphic	Proof	Group theory and generalizations
Weak solution	Definition	Partial differential equations
Reduced homology	Definition	Algebraic topology
Einstein–Hilbert action	Definition	Relativity and gravitational theory
Holography	Definition	Optics, electromagnetic theory
Gibbons–Hawking–York boundary term	Concept	Relativity and gravitational theory
Phylogenetic network	Definition	Biology and other natural sciences
Real form of a Lie group	Concept	Topological groups, Lie groups
Electric potential	Concept	Optics, electromagnetic theory
Mellin transform of a theta series and the zeta function	Example	Number theory
Model predictive control	Definition	Systems theory; control
Clifford theory	Theorem	Group theory and generalizations
Homological algebra	Concept	Category theory; homological algebra
Lagrangian density	Concept	Mechanics of particles and systems
Frame operator	Definition	Harmonic analysis on Euclidean spaces
Moore plane	Counterexample	General topology
Variety of algebras	Definition	General algebraic systems
Kolmogorov–Smirnov test	Definition	Statistics
Lp space	Concept	Functional analysis
Quaternionic analysis	Concept	Functions of a complex variable
Polar code	Concept	Information and communication theory, circuits
Artin group	Concept	Group theory and generalizations
Lebesgue differentiation theorem	Theorem	Measure and integration
Injective tensor product	Definition	Functional analysis
MUSCL scheme	Definition	Numerical analysis
Modification of a complex space	Concept	Several complex variables and analytic spaces
Vlasov–Poisson system	Concept	Partial differential equations
Denjoy–Carleman–Ahlfors theorem	Theorem	Functions of a complex variable
Initial value formulation of general relativity	Concept	Relativity and gravitational theory
Quasiconformal mapping	Concept	Functions of a complex variable
Weyl–von Neumann theorem	Theorem	Operator theory
Euler's laws of motion	Fact	Mechanics of particles and systems
NP	Definition	Computer science
Binary quadratic form	Concept	Number theory
Koenigs function	Definition	Functions of a complex variable
Weyl tensor	Concept	Differential geometry
Marsden–Weinstein reduction	Concept	Differential geometry
Stellar structure	Concept	Astronomy and astrophysics
Covariant formulation of classical electromagnetism	Definition	Optics, electromagnetic theory
Control system	Definition	Systems theory; control
F-space	Definition	Functional analysis
Supercompact cardinal	Definition	Mathematical logic and foundations
Ladyzhenskaya–Babuška–Brezzi condition	Theorem	Numerical analysis
Extremal graph theory	Concept	Combinatorics
Preadditive category	Concept	Category theory; homological algebra
Periodic boundary conditions	Definition	Ordinary differential equations
Elliptic operator	Definition	Operator theory
Fullerene graph	Object	Combinatorics
Accessible category	Definition	Category theory; homological algebra
Arbitrage	Definition	Game theory, economics, finance, and other social and behavioral sciences
Conic optimization	Definition	Operations research, mathematical programming
Positive-definite kernel	Concept	Functional analysis
Embedding of structures	Concept	General algebraic systems
Efficient frontier	Concept	Game theory, economics, finance, and other social and behavioral sciences
Pole placement theorem	Theorem	Systems theory; control