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- 2-Dimensional rotation matrix
- A-(A-B) = A cap B
- ASN
- A cap (B-C) = (A cap B) - C
- A collection of subsets is a sigma-algebra iff it is a Dynkin system and closed under finite intersections
- A compact and convex subset of Euclidean n-space with non-empty interior is a closed n-cell and its interior is an open n-cell
- A compact and convex subset of Euclidean n-space with non-empty interior is a closed n-cell and its interior is an open n-cell/Statement
- A continuous map induces a homomorphism on fundamental groups
- A function is a measure iff it measures the empty set as 0, disjoint sets add, and it is continuous from below (with equiv. conditions)
- A function is continuous if and only if the pre-image of every basis element is open
- A linear map is injective if and only if its kernel is trivial
- A linear map is injective if and only if the image of every non-zero vector is a non-zero vector
- A linear map is injective if and only if the kernel contains only the zero vector
- A map from two sigma-algebras, A and B, is measurable if and only if for some generator of B (call it G) we have the inverse image of S is in A for every S in G
- A map is continuous if and only if each point in the domain has an open neighbourhood for which the restriction of the map is continuous on
- A map is continuous if and only if the pre-image of every closed set is closed
- A monotonically increasing sequence bounded above converges
- A pair of identical elements is a singleton
- A pre-measure on a semi-ring may be extended uniquely to a pre-measure on a ring
- A proper vector subspace of a topological vector space has no interior
- A sequence consisting of the nth terms of the sequences in a Cauchy sequence of elements in any little-L space is itself a Cauchy sequence of complex numbers
- A set is bounded if and only if for all points in the space there is a positive real such that the distance from that point to any point in the set is less than the positive real
- A set is dense if and only if every non-empty open subset contains a point of it
- A set is open if and only if every point in the set has an open neighbourhood contained within the set
- A subset of a topological space is disconnected if and only if it can be covered by two non-empty-in-the-subset and disjoint-in-the-subset sets that are open in the space itself
- A subset of a topological space is disconnected if and only if it can be covered by two non-empty-in-the-subset and disjoint-in-the-subset sets that are open in the space itself/Statement
- A subset of a topological space is open if and only if it is a neighbourhood to all of its points
- A subspace of a Hausdorff space is Hausdorff
- A topological space is connected if and only if the only sets that are both open and closed in the space are the entire space itself and the emptyset
- A topological space is disconnected if and only if it is homeomorphic to a disjoint union of two or more non-empty topological spaces
- A topological space is disconnected if and only if there exists a non-constant continuous function from the space to the discrete space on two elements
- Abelian group
- Absolute value
- Absolute value (object)
- Abstract Algebra
- Abstract Algebra (subject)
- Abstract simplicial complex
- Addition of vector spaces
- Additive function
- Adjunction
- Adjunction topology
- Alec's base 5 conventions
- Alec's c.d.f-sidestepping sampling method
- Alec's expected value trick
- Alec's ordered data test
- Alec's puzzles
- Alec's puzzles/Statistics
- Alec's remaining probability bound
- Alec's sample mean bound
- Alec's taxonomy of units