| Capacity of a set | Definition | Potential theory |
| Multiplication by zero | Lemma | Mathematical logic and foundations |
| Centralizer and normalizer | Concept | |
| Weight (strings) | Concept | |
| Commuting graph | Concept | |
| Critical number | Concept | Real functions |
| Nonzero subspaces of R^n have a basis and a well-defined dimension | Theorem | Linear and multilinear algebra; matrix theory |
| Rank–nullity theorem for matrices | Theorem | Linear and multilinear algebra; matrix theory |
| Nth root | Concept | |
| Free-by-cyclic group | Concept | |
| Monotonic law for multiplication of integers | Theorem | Order, lattices, ordered algebraic structures |
| One is a two-sided multiplicative identity of the natural numbers | Lemma | Mathematical logic and foundations |
| Holomorph (mathematics) | Concept | |
| Z-transform | Definition | Integral transforms, operational calculus |
| Quaternary | Concept | |
| Strictly simple group | Concept | |
| Church's thesis (constructive mathematics) | Concept | |
| Egyptian fraction | Concept | |
| Associativity of multiplication of natural numbers | Theorem | Mathematical logic and foundations |
| Addition of integers is commutative, associative and cancellative | Theorem | Number theory |
| Commutativity of multiplication of natural numbers | Theorem | Mathematical logic and foundations |
| Monotonic law for addition of natural numbers | Theorem | Mathematical logic and foundations |
| Triangle-free graphs of every chromatic number | Proposition | Combinatorics |
| Spherical braid group | Concept | |
| Picard's theorem for systems with continuous partial derivatives | Theorem | Ordinary differential equations |
| Generalized binomial coefficient at minus one half | Lemma | Combinatorics |
| Alternative formula for the variance of a random variable | Proposition | Probability theory and stochastic processes |
| General solution of x'' = Ax with distinct nonpositive eigenvalues | Theorem | Ordinary differential equations |
| Lattice (discrete subgroup) | Concept | |
| Schröder–Bernstein theorem for finite sets | Proposition | Mathematical logic and foundations |
| 2-groups | Concept | |
| Clebsch invariant | Concept | |
| Orthogonality of eigenfunctions of the equation x'' + lambda x = 0 with standard boundary conditions | Theorem | Ordinary differential equations |
| Formula for the number of surjections between finite sets | Theorem | Combinatorics |
| Bezoutic | Concept | |
| Jucys–Murphy element | Concept | |
| Inclusion–exclusion formula for elements with none of the properties | Theorem | Combinatorics |
| Existence and uniqueness for second-order linear initial value problems | Theorem | Ordinary differential equations |
| Group ring | Definition | Associative rings and algebras |
| Root system | Definition | Nonassociative rings and algebras |
| Attainable null space | Definition | Functional analysis |
| Convolution of central binomial coefficients | Corollary | Combinatorics |
| Ratio and root limits give the radius of convergence | Theorem | Functions of a complex variable |
| Recurrence for the falling factorial | Lemma | Combinatorics |
| Transitivity of the pair relation for constructing the integers | Lemma | Number theory |
| Arithmetic Fuchsian group | Concept | |
| Oscillation of a function | Definition | Real functions |
| Infinity | Concept | |
| Limiting proportion of derangements | Theorem | Combinatorics |
| Topological manifold | Definition | Manifolds and cell complexes |
| Product formula for the totient function | Theorem | Number theory |
| Division with remainder for natural numbers | Theorem | Number theory |
| Count of integers up to n divisible by a set of primes dividing n | Proposition | Number theory |
| Concave up and concave down | Concept | Real functions |
| Addition and multiplication of rationals respect equality | Theorem | Number theory |
| π | Concept | |
| No surjection from the positive integers onto the unit interval | Proposition | Mathematical logic and foundations |
Math 2.0