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.

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a group $G$ whose elements are invertible $n \times n$ matrices over a field $F$.
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In Mathematics, set theory, a Multivalued function is defined as a left-total relation (that is, every input is associated with at least one output) in which at least one input is associated with mult…
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For questions about the structure of product space, in the context of topology or measure theory for example. Use other tags to indicate the context.
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The study of geometry of manifolds without appealing to differential calculus. It includes studies of length spaces, Alexandrov spaces, and CAT(k) spaces. The techniques are often applicable to Rieman…
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The study of how mathematical objects (complex manifolds, associative algebras, Lie algebras) can be deformed into similar mathematical objects, at least infinitesimally.
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Questions relating to the representations of the absolute Galois group $\mathrm{Gal}(\overline K/K)$ of a number field or of a local field.
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For questions about Goldbach's conjecture: every even integer greater than two is the sum of two primes.
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A technique in geometry (especially algebraic and differential, and by extension to study of pseudo-differential operators) for resolution of singularities. Not to be confused with the formation of si…
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A groupoid (in the sense of category theory) is a small category in which every morphism is an isomorphism. Groupoids arise throughout mathematics, e.g. in guise of fundamental groupoids in the theory…
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For questions regarding profinite groups and their properties.
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Questions on quadratic variations of stochastic processes. (Not to be confused with functions of bounded variation.)
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For questions pertaining to power towers: expressions like a^(b^(c^d))), which result from iterated exponentiation. The "hyperoperation" tag may be appropriate, too.
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Questions on the Möbius function μ(n), an arithmetic function used in number theory.
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A method of generating a polynomial that crosses through a set of data. The degree of this polynomial is equal to the size of the data.
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flat when the right-exact "tensor by $M$" functor becomes left exact (and therefore exact). This applies to $A$-algebras as the latter are $A$-module, saying that $B$ flat over $A…
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Questions related to mathematical chemistry which include application of mathematics to problems in chemistry and the development of mathematical methods suitable for such applications and for the for…
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Computation of Cauchy principal values of integrals. May be tied in with contour integration, but should be separate from definite-integrals.
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when posting questions related to the concept of convexity and geometry. For example, for convex polygons.
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for questions about combinatorial and computational issues with regards to calendar systems. A typical, well-known mathematical result in this direction is John Conway's Doomsday Algorithm…
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Quantum Computation deals with considering computation as fundamentally physical, as well as replacing the classical binary digit (bit) with the quantum binary digit (qubit). While the classical bit i…
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To be used when the technique of Integration By Parts is the dominant topic of the question.
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Questions about mathematicians and their lives.
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The Lie derivative gives a way to define the derivative of a tensor field in the direction of a vector field.
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meant for questions which are generalized forms of questions which get asked frequently. See tag details for more information.
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a generalization of the idea of periodic functions in Euclidean space to general topological groups.
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"The centroid or geometric center of a plane figure is the arithmetic mean ("average") position of all the points in the shape. " This tag is for questions about the centroid of a geometrical shape…
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For questions about coalgebras, comultiplication, counity, comodules, coactions, corepresentations, subcoalgebras, coideals, cosemisimplicity, ...
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a result about integration of differential forms.
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integral operators with kernel $K:\mathbb{R}^n\times\mathbb{R}^n\to\mathbb{R}$ that is not defined on the diagonal $x=y.$ This tag is for questions related to singular integrals…
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For question on extrapolation, the process of estimating, beyond the original observation interval.
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a trail in a graph which visits every edge exactly once.