A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.
For questions regarding groups of even prime power order, as distinct from p-groups in general. Topics include 2-groups of maximal class, 2-groups as Sylow subgroups, and the conjecture that almost al…
For things related to 3 dimensions. For geometry of 3-dimensional solids, please use instead (solid-geometry). For non-planar geometry, but otherwise agnostic of dimensions, perhaps (euclidean-geometr…
For questions about proving and manipulating the AM-GM inequality. To be used necessarily with [tag:inequality] tag.
categories that possess most of properties of categories of modules over a ring, e.g. abelian group structure on morphisms, existence of kernels and cokernels of morphisms, exis…
Should be used with the (group-theory) tag. A group $(G,*)$ is said to be abelian if $a*b=b*a$ for all $a,b\in G.$
In mathematics, particularly in algebraic geometry, complex analysis and number theory, an abelian variety is a projective algebraic variety that is also an algebraic group, i.e., has a group law that…
for questions related to absolute continuity, which is a smoothness property of functions stronger than that of continuity and uniform continuity.
for questions related to absolute convergence a series.
For questions about or involving the absolute value function.
For questions about groups, rings, fields, vector spaces, modules and other algebraic objects. Associate with related tags like group-theory, ring-theory, modules, etc. to clarify which topic of abstr…
For questions about accessible categories, accessible functors, and their properties. Use in conjonction with the tag (category-theory).
An example of a total computable function that is not primitive recursive; appears in the literature in many variants. The original three argument variant can be used to define the Ackermann numbers.
a discipline that uses mathematics and statistics to assess risk. The mathematics involved in actuarial science includes probability, statistics, finance, life insurance mathemat…
For questions dealing with additive or pre-additive categories.
about giving combinatorial estimates of addition and subtraction operations on Abelian groups or other algebraic objects. Key words: sum set estimates, inverse theorems, grap…
For questions on groups and rings of adeles, self-dual topological rings built on an algebraic number field.
a square matrix used to represent a finite graph. The elements of the matrix indicate whether pairs of vertices are adjacent or not. In the special case of a finite simple graph…
For questions about adjoint functors from category theory. Use in conjunction with the tag (category-theory).
For questions about adjoint operators in inner product spaces. For adjoint functors from category theory, use the tag (adjoint-functors).
Questions asking for advice on various mathematical matters. Be careful that your question is answerable, and also that it is not a polling question (e.g. "What is the best / your favorite way to..."…
for questions about algebraic geometry that focus on affine space. For affine mappings in linear algebra (i.e. linear mappings plus translations), please use the linear-algebra tag or another appropri…
The spectrum of a commutative ring with unit is the set of prime ideals endowed with the Zariski topology. One can define a sheaf of rings on this space : to each Zariski-open set is assigned a commut…
for questions related to an affine variety over an algebraically-closed field.
For questions about Airy functions, the solution to Schrödinger's equation for a particle confined within a triangular potential well and for a particle in a one-dimensional constant force field.
For questions about the Alexandroff double circle, also called "Concentric Circles" in Steen & Seebach's "Counterexamples in Topology".
For problems involving algebraic methods in combinatorics (especially group theory and representation theory) as well as combinatorial methods in abstract algebra.
an algebraic variety of dimension one. An affine algebraic curve can be described as the zero-locus of $n-1$ independent polynomials of $n$ variables in affine $n$-space over a f…