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 151–300 of 1702.

Name	Kind	Subject
Matrix multiplication	Concept	Linear and multilinear algebra; matrix theory
Projection	Concept	Linear and multilinear algebra; matrix theory
Nine-point circle	Concept	Geometry
Markov chain	Definition	Probability theory and stochastic processes
Formal power series	Concept	Commutative algebra
Hyperbolic cosine	Concept	Special functions
Statistic	Definition	Statistics
Dirichlet convolution	Concept	Number theory
Leibniz formula for pi	Theorem	Sequences, series, summability
Arzelà–Ascoli theorem	Theorem	General topology
Bernoulli distribution	Concept	Probability theory and stochastic processes
Chromatic polynomial	Definition	Combinatorics
Freshman's dream	Theorem	Commutative algebra
Characteristic polynomial	Definition	Linear and multilinear algebra; matrix theory
Independence of two events	Concept	Probability theory and stochastic processes
Column space	Concept	Linear and multilinear algebra; matrix theory
Modulo operation	Concept	Number theory
Multivalued function	Concept	Real functions
Cauchy–Euler equation	Concept	Ordinary differential equations
Range of a function	Concept	Mathematical logic and foundations
Irreducible polynomial	Concept	Field theory and polynomials
Vector triple product	Proposition	Linear and multilinear algebra; matrix theory
P-adic valuation	Concept	Number theory
Antichain	Concept	Order, lattices, ordered algebraic structures
Triangle inequality	Theorem	Real functions
Regular space	Concept	General topology
Normed vector space	Concept	Functional analysis
Separable polynomial	Definition	Field theory and polynomials
Wilson's theorem	Theorem	Number theory
Equivalence of norms in finite dimension	Theorem	Functional analysis
de Moivre's formula	Theorem	Special functions
Path	Concept	Combinatorics
Minimal polynomial	Concept	Linear and multilinear algebra; matrix theory
Second-countable space	Concept	General topology
Taylor's theorem	Theorem	Approximations and expansions
Skew-symmetric matrix	Definition	Linear and multilinear algebra; matrix theory
Continuous linear map	Concept	Operator theory
Indefinite integral	Definition	Real functions
Circumcircle	Concept	Geometry
Sample mean	Concept	Statistics
Open mapping theorem	Theorem	Functions of a complex variable
Binet's formula	Theorem	Number theory
Integer partition	Definition	Combinatorics
Entire function	Definition	Functions of a complex variable
Nilpotent matrix	Definition	Linear and multilinear algebra; matrix theory
Rational canonical form	Theorem	Linear and multilinear algebra; matrix theory
Fermat's theorem on sums of two squares	Theorem	Number theory
Maclaurin series	Definition	Approximations and expansions
Multilinear map	Concept	Linear and multilinear algebra; matrix theory
Diagonal matrix	Concept	Linear and multilinear algebra; matrix theory
Circle	Definition	Geometry
Closed curve	Concept	Differential geometry
Variance	Concept	Probability theory and stochastic processes
Jacobian matrix	Concept	Real functions
Parseval's identity	Theorem	Functional analysis
Maximum modulus principle	Theorem	Functions of a complex variable
Concyclic points	Concept	Geometry
Open cover	Concept	General topology
Complementary subspaces	Definition	Linear and multilinear algebra; matrix theory
Field	Concept	Field theory and polynomials
Correlation coefficient	Definition	Statistics
Inverse hyperbolic functions	Definition	Special functions
Natural logarithm	Concept	Special functions
Commutativity	Definition	General algebraic systems
Circle group	Object	Topological groups, Lie groups
Spectrum of a matrix	Definition	Linear and multilinear algebra; matrix theory
Modulo operation	Definition	Number theory
Separation axioms	Concept	General topology
Divisor function	Concept	Number theory
Hockey-stick identity	Theorem	Combinatorics
Clique number	Concept	Combinatorics
Sum of two squares theorem	Theorem	Number theory
Continued fraction	Concept	Number theory
Geometric distribution	Concept	Probability theory and stochastic processes
Lyapunov function	Definition	Ordinary differential equations
Index of a subgroup	Definition	Group theory and generalizations
Dedekind cut	Definition	Real functions
Euler's formula	Theorem	Special functions
Classification of discontinuities	Concept	Real functions
Zorn's lemma	Theorem	Mathematical logic and foundations
Parabola	Concept	Geometry
Product topology on an arbitrary product	Definition	General topology
Doubling the cube	Problem	Geometry
Definite integral	Concept	Real functions
P-adic valuation	Definition	Number theory
Random walk	Concept	Probability theory and stochastic processes
Sigma-algebra	Definition	Measure and integration
Elementary row operations	Concept	Linear and multilinear algebra; matrix theory
Probability density function	Definition	Probability theory and stochastic processes
Comparison test	Theorem	Sequences, series, summability
Tautology	Concept	Mathematical logic and foundations
Symmetric group	Concept	Group theory and generalizations
Euclid's lemma	Lemma	Number theory
Graph homomorphism	Concept	Combinatorics
Irreducible element	Definition	Commutative algebra
Complex exponential	Definition	Special functions
Sesquilinear form	Concept	Linear and multilinear algebra; matrix theory
Lipschitz condition	Definition	Real functions
Jordan measure	Definition	Measure and integration
Pointwise convergence	Definition	Sequences, series, summability
Parametrised surface	Definition	Differential geometry
Binary operation	Definition	General algebraic systems
Ptolemy's theorem	Theorem	Geometry
Probability measure	Concept	Probability theory and stochastic processes
Normal distribution	Concept	Probability theory and stochastic processes
Binary relation	Concept	Mathematical logic and foundations
Partial derivative	Definition	Real functions
Jump discontinuity	Definition	Real functions
Boundary	Concept	General topology
Zeckendorf's theorem	Theorem	Number theory
Pascal's triangle	Object	Combinatorics
Closed ball	Definition	General topology
Having a directional derivative	Definition	Real functions
Vector space	Definition	Linear and multilinear algebra; matrix theory
Polarisation identity	Proposition	Functional analysis
Likelihood function	Definition	Statistics
Union of a family of sets	Definition	Mathematical logic and foundations
T1 space	Definition	General topology
Homeomorphism	Definition	General topology
Root test	Theorem	Sequences, series, summability
Dihedral angle	Concept	Geometry
Dot product	Definition	Linear and multilinear algebra; matrix theory
Transitive closure	Concept	Mathematical logic and foundations
Improper integral	Concept	Real functions
Limit of a sequence	Concept	Sequences, series, summability
Cross-ratio	Definition	Functions of a complex variable
Eulerian trail	Concept	Combinatorics
Markov's inequality	Theorem	Probability theory and stochastic processes
Family of sets	Definition	Mathematical logic and foundations
Finitely generated module	Concept	Commutative algebra
Conservative vector field	Definition	Real functions
Truth table	Concept	Mathematical logic and foundations
Permutation	Concept	Combinatorics
Standard score	Definition	Statistics
Poisson point process	Definition	Probability theory and stochastic processes
Phase plane	Concept	Ordinary differential equations
Inverse trigonometric functions	Concept	Special functions
Set difference	Concept	Mathematical logic and foundations
Laplace transform	Definition	Integral transforms, operational calculus
Isolated singularity	Concept	Functions of a complex variable
Perfect matching	Definition	Combinatorics
Circle	Concept	Geometry
Law of cosines	Theorem	Geometry
Carmichael number	Concept	Number theory
Lucas–Lehmer test	Theorem	Number theory
Symmetric relation	Concept	Mathematical logic and foundations
Tree	Concept	Combinatorics
Gamma distribution	Definition	Probability theory and stochastic processes
First fundamental theorem of calculus	Theorem	Real functions
Metric space	Definition	General topology