Nodes at W1, stated

The main section of the kind, a source with a locator, and a body that passes the rules B01 to B03.

Ideas 1–150 of 1722.

Name	Kind	Subject
Vector space	Concept	Linear and multilinear algebra; matrix theory
Singular value decomposition	Theorem	Linear and multilinear algebra; matrix theory
Quotient set	Concept	Mathematical logic and foundations
Partition function	Definition	Number theory
Block diagonal matrix	Concept	Linear and multilinear algebra; matrix theory
Differential equation	Concept	Ordinary differential equations
Natural logarithm	Definition	Special functions
Jump discontinuity	Concept	Real functions
Exterior derivative	Definition	Global analysis, analysis on manifolds
Square-free integer	Definition	Number theory
Quotient ring	Concept	Associative rings and algebras
Least common multiple	Concept	Number theory
Variance	Definition	Probability theory and stochastic processes
Composite number	Concept	Number theory
Local maximum	Definition	Real functions
Normed vector space	Definition	Functional analysis
Principal ideal	Definition	Commutative algebra
Platonic solid	Definition	Geometry
Finite intersection property	Proposition	General topology
Graph	Concept	Combinatorics
Polyhedron	Definition	Convex and discrete geometry
Euler–Mascheroni constant	Object	Number theory
Countably infinite set	Concept	Mathematical logic and foundations
Graph isomorphism	Definition	Combinatorics
Power set	Concept	Mathematical logic and foundations
Euclidean vector	Definition	Geometry
Hasse diagram	Concept	Order, lattices, ordered algebraic structures
Contour integral	Definition	Functions of a complex variable
Modular multiplicative inverse	Definition	Number theory
Direct product of groups	Concept	Group theory and generalizations
Conic section	Concept	Geometry
Trisecting the angle	Problem	Geometry
Lower triangular matrix	Concept	Linear and multilinear algebra; matrix theory
Multinomial coefficient	Definition	Combinatorics
Intermediate value theorem	Theorem	Real functions
Determinant	Concept	Linear and multilinear algebra; matrix theory
Prime ideal	Concept	Commutative algebra
Saddle point	Definition	Real functions
Power of a point	Definition	Geometry
Positive definite quadratic form	Definition	Linear and multilinear algebra; matrix theory
Second-countable space	Definition	General topology
Absolute value	Definition	Real functions
Gram matrix	Concept	Linear and multilinear algebra; matrix theory
Event	Definition	Probability theory and stochastic processes
Transcendental element	Definition	Field theory and polynomials
Ramsey's theorem	Theorem	Combinatorics
Irreducible polynomial	Definition	Field theory and polynomials
Linear subspace	Concept	Linear and multilinear algebra; matrix theory
Ordered field	Definition	Field theory and polynomials
Hensel's lemma	Theorem	Number theory
Partial order	Definition	Order, lattices, ordered algebraic structures
Hölder continuity	Concept	Real functions
Semidirect product	Definition	Group theory and generalizations
Cayley's theorem	Theorem	Group theory and generalizations
Principal branch	Concept	Functions of a complex variable
Alternating series	Definition	Sequences, series, summability
Platonic solid	Concept	Geometry
Prime number	Concept	Number theory
Vector-valued function	Concept	Real functions
Rolle's theorem	Theorem	Real functions
Unit of a ring	Definition	Associative rings and algebras
Chapman–Kolmogorov equation	Theorem	Probability theory and stochastic processes
Block matrix	Definition	Linear and multilinear algebra; matrix theory
Bias of an estimator	Definition	Statistics
Well-ordering principle	Theorem	Mathematical logic and foundations
Well-order	Concept	Order, lattices, ordered algebraic structures
Characteristic subgroup	Definition	Group theory and generalizations
Totally disconnected space	Definition	General topology
Ramsey number	Definition	Combinatorics
Public-key cryptography	Concept	Information and communication theory, circuits
Inner product space	Definition	Linear and multilinear algebra; matrix theory
Urysohn's lemma	Lemma	General topology
Pythagorean triple	Definition	Number theory
Generalised eigenvector	Concept	Linear and multilinear algebra; matrix theory
Divergent sequence	Definition	Sequences, series, summability
Legendre symbol	Definition	Number theory
Vandermonde's identity	Theorem	Combinatorics
Regular polygon	Concept	Geometry
Multigraph	Definition	Combinatorics
Antisymmetric relation	Definition	Mathematical logic and foundations
Infinite set	Definition	Mathematical logic and foundations
Positive semidefinite matrix	Concept	Linear and multilinear algebra; matrix theory
Cauchy's integral theorem	Theorem	Functions of a complex variable
Isolated point	Definition	General topology
Hyperbolic functions	Concept	Special functions
Spherical coordinates	Concept	Geometry
Tangent line	Concept	Real functions
Lyapunov function	Concept	Ordinary differential equations
Residue class	Concept	Number theory
Surjective function	Concept	Mathematical logic and foundations
Integrating factor	Definition	Ordinary differential equations
Countable set	Concept	Mathematical logic and foundations
Symmetry of second derivatives	Theorem	Real functions
Prime element	Concept	Commutative algebra
Connected component	Definition	Combinatorics
Central binomial coefficient	Definition	Combinatorics
Cassini's identity	Theorem	Number theory
Moment	Concept	Probability theory and stochastic processes
Constructive proof	Concept	Mathematical logic and foundations
Open set	Definition	General topology
Carathéodory's theorem	Theorem	Convex and discrete geometry
Matrix exponential	Concept	Linear and multilinear algebra; matrix theory
Totally bounded set	Concept	General topology
Free group	Definition	Group theory and generalizations
Definite integral	Definition	Real functions
Taylor series	Definition	Approximations and expansions
Well-founded relation	Definition	Mathematical logic and foundations
Reflection	Definition	Linear and multilinear algebra; matrix theory
Conjunction	Concept	Mathematical logic and foundations
Parallelogram law	Proposition	Functional analysis
Similar matrices	Definition	Linear and multilinear algebra; matrix theory
Reflection in a line or plane	Definition	Geometry
Exponential distribution	Definition	Probability theory and stochastic processes
Flow of a vector field	Definition	Dynamical systems and ergodic theory
Euclid's theorem	Theorem	Number theory
Vector field	Concept	Real functions
Negation	Concept	Mathematical logic and foundations
Planar graph	Definition	Combinatorics
Binary tree	Definition	Combinatorics
Convex set	Concept	Convex and discrete geometry
Open set	Concept	General topology
Eisenstein's criterion	Theorem	Field theory and polynomials
Covariance matrix	Definition	Statistics
Edge colouring	Definition	Combinatorics
Free module	Definition	Associative rings and algebras
Power of a point	Concept	Geometry
Prime factorization	Concept	Number theory
Casorati–Weierstrass theorem	Theorem	Functions of a complex variable
Isometry	Concept	General topology
Inverse trigonometric functions	Definition	Special functions
Chebyshev's inequality	Theorem	Probability theory and stochastic processes
Discrete uniform distribution	Concept	Probability theory and stochastic processes
Divergence	Definition	Real functions
Splitting field	Definition	Field theory and polynomials
Line integral of a scalar field	Concept	Real functions
Multiplicative order	Concept	Number theory
Algebraically closed field	Definition	Field theory and polynomials
Topological property	Concept	General topology
Reduction of order	Concept	Ordinary differential equations
Greatest common divisor	Definition	Number theory
Riemann mapping theorem	Theorem	Functions of a complex variable
Kernel of a linear map	Definition	Linear and multilinear algebra; matrix theory
Conditional convergence	Definition	Sequences, series, summability
One-form	Concept	Global analysis, analysis on manifolds
Partial fraction decomposition	Concept	Real functions
Commutative ring	Concept	Commutative algebra
Total order	Definition	Order, lattices, ordered algebraic structures
Event	Concept	Probability theory and stochastic processes
Polyhedron	Concept	Convex and discrete geometry
Residue theorem	Theorem	Functions of a complex variable