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:
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For questions on the subject of "satisfiability", that is, whether there exists an interpretation/model in which a given (logical) formula is true.
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Questions involving the formulation or evaluation of trigonometric functions.
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An simple graph has a symmetric matrix L = D - A associated with it called the Laplacian matrix, where D is the diagonal matrix of degrees and A is the adjacency matrix, often studied for its spectrum…
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For questions about elliptic partial differential equations. If your question is specific to the Laplace equation, see (harmonic-functions).
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For questions about complex manifolds.
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A tag for all questions involving a type of utility function.
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For questions involving the Legendre symbol, $\genfrac{(}{)}{}{}{a}{p}$ for integer $a$ and prime $p$.
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a form of many-valued logic that deals with approximate, rather than fixed and exact reasoning. (Def: http://en.m.wikipedia.org/wiki/Fuzzy_logic)
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For questions about linear approximations, $f(x) \approx f(a)+f'(a)(x-a)$ for $x$ around $a$.
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a group $G$ whose elements are invertible $n \times n$ matrices over a field $F$.
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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 involving the chain rule in analysis.
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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 classifying space $BG$ of a topological group $G$ is the quotient of a weakly contractible space $EG$ by a free action of $G$. When $G$ is a discrete group $BG$ has homotopy type of $K(G,1)$ and (co…
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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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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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For questions about Beta function, a special function closely related to Gamma. It is advisable to also use [special-functions] tag with this one.
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a generalization of the idea of periodic functions in Euclidean space to general topological groups.
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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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Questions about mathematicians and their lives.
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the study of invariants of large matrices, in a suitable sense. It has many variations: (algebraic-k-theory), (topological-k-theory), or in the study of (operator-algebras).
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Questions on quadratic variations of stochastic processes. (Not to be confused with functions of bounded variation.)
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typically defined to be without boundaries (every point has a neighbourhood homeomorphic to an Euclidean open disc). Use this tag for the manifolds with boundaries, as well as manifolds …
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