Every idea

Ideas 14851–15000 of 19875.

Name	Kind	Subject
Dyson series	Concept	Quantum theory
Positive definiteness of the energy	Theorem	Potential theory
Krull dimension of a noncommutative ring	Concept	Associative rings and algebras
Bayes estimator	Concept	Statistics
Peaucellier–Lipkin linkage	Object	Mechanics of particles and systems
Butterfly effect	Definition	Dynamical systems and ergodic theory
Lagrange multipliers for constraints	Definition	Mechanics of particles and systems
Stochastic dynamic programming	Definition	Operations research, mathematical programming
Harmonic coordinate condition	Concept	Relativity and gravitational theory
Horocycle	Definition	Geometry
Computable set	Concept	Mathematical logic and foundations
Blahut–Arimoto algorithm	Concept	Information and communication theory, circuits
Friedmann equations	Theorem	Relativity and gravitational theory
Berlekamp–Massey algorithm	Definition	Information and communication theory, circuits
Cole–Hopf transformation	Definition	Partial differential equations
Deflection of the vertical	Definition	Geophysics
Calderón–Zygmund kernel	Definition	Harmonic analysis on Euclidean spaces
Gibbard's theorem	Theorem	Game theory, economics, finance, and other social and behavioral sciences
Cauchy–Riemann operator	Concept	Several complex variables and analytic spaces
Reproducing kernel Hilbert space	Definition	Functional analysis
Quadratic transformations of hypergeometric functions	Theorem	Special functions
Field of extremals	Definition	Calculus of variations and optimal control; optimization
Strain tensor	Definition	Mechanics of deformable solids
Dixon elliptic functions	Concept	Special functions
Rolling without slipping	Concept	Mechanics of particles and systems
Real algebraic geometry	Concept	Algebraic geometry
Fredholm determinant	Concept	Integral equations
Bulk modulus	Concept	Mechanics of deformable solids
Roche limit	Proposition	Mechanics of particles and systems
Hankel matrix	Concept	Linear and multilinear algebra; matrix theory
Calculus of variations	Concept	Calculus of variations and optimal control; optimization
Law of mass action	Theorem	Classical thermodynamics, heat transfer
Zero-order hold	Concept	Systems theory; control
Sheaf cohomology	Concept	Algebraic geometry
Symplectic vector space	Concept	Linear and multilinear algebra; matrix theory
Maxwell material	Example	Mechanics of deformable solids
Classical group	Definition	Group theory and generalizations
Kullback–Leibler divergence	Concept	Information and communication theory, circuits
Equivalence of Boolean rings and Boolean algebras	Theorem	Order, lattices, ordered algebraic structures
Natural boundary	Concept	Functions of a complex variable
Infinitary logic	Concept	Mathematical logic and foundations
Beta normal form	Definition	Mathematical logic and foundations
von Neumann mean ergodic theorem	Theorem	Operator theory
Coriolis force	Definition	Mechanics of particles and systems
Pro-object	Definition	Category theory; homological algebra
Fractional viscoelastic models	Definition	Mechanics of deformable solids
Binary quadratic form	Definition	Number theory
Measure	Concept	Measure and integration
Separation of variables	Definition	Ordinary differential equations
Noisy-channel coding theorem	Theorem	Information and communication theory, circuits
Playfair's axiom	Fact	Geometry
Cutting-plane method	Concept	Operations research, mathematical programming
Left regular representation	Concept	Topological groups, Lie groups
Riesz measure of a subharmonic function	Concept	Potential theory
U-statistic	Definition	Statistics
Biharmonic equation	Definition	Potential theory
Tian–Todorov theorem	Theorem	Several complex variables and analytic spaces
Stochastic partial differential equation	Concept	Probability theory and stochastic processes
Seiberg–Witten invariants	Concept	Manifolds and cell complexes
Existence of optimal stationary policies	Theorem	Operations research, mathematical programming
Subobject classifier	Definition	Category theory; homological algebra
Eta invariant	Concept	Global analysis, analysis on manifolds
Conformal compactification and Penrose diagram	Definition	Relativity and gravitational theory
Paratopological group	Definition	Topological groups, Lie groups
Alexander's theorem on closed braids	Theorem	Manifolds and cell complexes
Asymptotically flat spacetime	Definition	Relativity and gravitational theory
Euler–Lagrange equation	Concept	Calculus of variations and optimal control; optimization
Vector measure	Concept	Measure and integration
Noncommutative geometry	Concept	Global analysis, analysis on manifolds
Basic open set	Definition	Algebraic geometry
Lie algebroid	Concept	Differential geometry
Adiabatic process	Definition	Classical thermodynamics, heat transfer
Rudin–Shapiro polynomials	Example	Harmonic analysis on Euclidean spaces
Slip-line field theory	Concept	Mechanics of deformable solids
Operations research	Concept	Operations research, mathematical programming
Homotopy invariance of K-theory for regular rings	Theorem	K-theory
Janko groups	Object	Group theory and generalizations
Ehrenfest classification of phase transitions	Definition	Statistical mechanics, structure of matter
Von Neumann algebra	Concept	Functional analysis
Laguerre–Gaussian modes	Definition	Optics, electromagnetic theory
Amoeba	Concept	Algebraic geometry
Greedy algorithm	Concept	Computer science
IEEE 754 standard	Definition	Numerical analysis
Polhode	Definition	Mechanics of particles and systems
Kepler problem in general relativity	Problem	Relativity and gravitational theory
Beurling–Ahlfors transform	Definition	Harmonic analysis on Euclidean spaces
Riemannian distance	Definition	Differential geometry
Complex manifold	Definition	Several complex variables and analytic spaces
Descartes's theorem on total angular defect	Theorem	Convex and discrete geometry
Fractional Brownian motion	Definition	Probability theory and stochastic processes
Quasi-coherent sheaf	Definition	Algebraic geometry
Killing vector field	Definition	Differential geometry
Gauss–Kronrod quadrature formula	Concept	Numerical analysis
BPP	Concept	Computer science
Chaplygin's equation	Definition	Fluid mechanics
Bayesian hierarchical model	Definition	Statistics
Clone	Concept	General algebraic systems
Bifurcation theory	Definition	Dynamical systems and ergodic theory
Nonholonomic system	Concept	Mechanics of particles and systems
K-epsilon turbulence model	Definition	Fluid mechanics
KR-theory	Definition	K-theory
Principle of relativity	Definition	Relativity and gravitational theory
Premeasure	Concept	Measure and integration
L-estimator	Definition	Statistics
Spectral theory of dynamical systems	Definition	Dynamical systems and ergodic theory
Stommel's model of western intensification	Proposition	Geophysics
Lindelöf hypothesis	Conjecture	Number theory
Partial differential equation	Definition	Partial differential equations
Sublattice	Concept	Order, lattices, ordered algebraic structures
Grauert's solution of the Levi problem for manifolds	Theorem	Several complex variables and analytic spaces
Transport equation	Concept	Partial differential equations
Quasistatic process	Concept	Classical thermodynamics, heat transfer
Cancellation law of addition for natural numbers	Theorem	Mathematical logic and foundations
Doubling on the integers is not an isomorphism	Example	Group theory and generalizations
Relaxation modulus	Definition	Mechanics of deformable solids
Faber polynomials	Concept	Functions of a complex variable
Matroid	Definition	Combinatorics
Weak ordering	Concept	Order, lattices, ordered algebraic structures
Small cancellation theory	Definition	Group theory and generalizations
Wilf–Zeilberger pair	Definition	Special functions
Sawtooth wave	Example	Harmonic analysis on Euclidean spaces
Conditional mutual information	Concept	Information and communication theory, circuits
Laplace transform of distributions	Definition	Functional analysis
Unknotting number	Concept	Manifolds and cell complexes
Mohr's circle	Definition	Mechanics of deformable solids
Life table	Concept	Game theory, economics, finance, and other social and behavioral sciences
Added mass	Definition	Fluid mechanics
Antipode	Definition	Associative rings and algebras
Hodge Laplacian	Concept	Global analysis, analysis on manifolds
Signature	Definition	Mathematical logic and foundations
Grothendieck universe	Definition	Mathematical logic and foundations
Levy–Desplanques theorem	Theorem	Linear and multilinear algebra; matrix theory
Perfect closure	Concept	Field theory and polynomials
Cyclic extension	Definition	Field theory and polynomials
Atlas	Definition	Manifolds and cell complexes
Similarity solution for the heat equation	Concept	Partial differential equations
Erdős–Hajnal conjecture	Conjecture	Combinatorics
Countable additivity	Definition	Measure and integration
Matroid	Concept	Combinatorics
Happy ending problem	Problem	Convex and discrete geometry
Bogoliubov theory of the weakly interacting Bose gas	Definition	Statistical mechanics, structure of matter
Uniformly convex space	Definition	Functional analysis
Pivotal quantity	Concept	Statistics
Floyd–Warshall algorithm	Definition	Combinatorics
Dahlberg's theorem on harmonic measure	Theorem	Potential theory
Normal function	Definition	Mathematical logic and foundations
Feasible region	Definition	Operations research, mathematical programming
Morley rank	Definition	Mathematical logic and foundations
Koecher–Vinberg theorem	Theorem	Nonassociative rings and algebras
Normal basis theorem	Theorem	Field theory and polynomials