# Tags

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.

 Type to find tags:
 2-categories× 9 a category with "morphisms between morphisms". 2-groups× 8 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… 3d× 840 is for things related to 3-dimensions. For geometry of 3-dimensional solids, please use instead (solid-geometry). For geometry that is not on a plane, but otherwise agnostic of dimensions… abelian-categories× 200 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… abelian-groups× 985 Should be used with the (group-theory) tag. A group $(G,*)$ is said to be abelian if $a*b=b*a$ for all $a,b\in G.$ abelian-varieties× 55 absolute-convergence× 78 for questions related to absolute convergence a series. absolute-value× 610 For questions about or involving the absolute value function. abstract-algebra× 23949 the study of algebraic objects. Some of the more common algebraic objects are groups, rings, fields, vector spaces, modules, among other topics. ac.commutative-algebra ackermann-function× 9 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. ackermann-number actuarial-science× 191 a discipline that uses mathematics and statistics to assess risk. The mathematics involved in actuarial science includes probability, statistics, finance, life insurance mathemat… addition additive-categories× 4 For questions dealing with additive categories. additive-combinatorics× 84 about giving combinatorial estimates of addition and subtraction operations on Abelian groups or other algebraic objects. Key words: sum set estimates, inverse theorems, grap… adeles× 15 For questions on groups and rings of adeles, self-dual topological rings built on an algebraic number field. adjoint× 226 For questions about adjoints, in the category-theoretic or inner-product-space sense, as well as about adjugate matrices. advice× 423 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..."… affine-geometry× 278 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… affine-schemes× 63 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… ag.algebraic-geometry algebraic-closure algebraic-combinatorics× 16 For problems and questions concerning the specific field of algebraic combinatorics. algebraic-curves× 749 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… algebraic-geometry× 7751 The study of geometric objects defined by polynomial equations, as well as their generalizations: algebraic curves, such as elliptic curves, and more generally algebraic varieties, schemes, etc. Probl… algebraic-graph-theory× 222 Studying graphs using algebra (for example, linear algebra and abstract algebra) as a tool. algebraic-groups× 370 For questions about groups which have additional structure as a algebraic varieties (the vanishing sets of collections of polynomials) which is compatible with their group structure. Consider using… algebraic-identities× 122 For questions regarding identities in algebraic structures, including the construction, composition, and interpretation thereof. algebraic-k-theory× 39 a tool from homological algebra that defines a sequence of functors from rings to abelian groups. It has many applications in algebraic geometry. See also (topological-k-theory). algebraic-logic× 2 algebraic-number-theory× 2105 Questions related to the algebraic structure of algebraic integers algebraic-stacks× 11 algebraic-systems× 6 algebraic-topology× 5435 Questions about algebraic methods and invariants to study and classify topological spaces: homotopy groups, (co)-homology groups, and beyond. algebra-precalculus× 13656 Linear, exponential, logarithmic, polynomial, rational, and trigonometric functions, conic sections, binomial, surds, graphs and transformations of graphs, equation- and system-solving, and other symb…