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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For questions regarding the structure and properties of compact manifolds.
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For question about the Schwartz space, a vector space of smooth functions stable under the Fourier transform.
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For question on Tessellations, the process of creating a two-dimensional plane using the repetition of a geometric shape with no overlaps and no gaps.
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a discrete analogue to the Laplace transform, in that it maps a time domain signal into a representation in complex frequency plane.
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Inverse problems involve for example reconstruction of an object based on physical measurements and finding a best model/parameters out of a family given observed data. Typically the corresponding "fo…
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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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A branch of topology that deals with the notion of a fiber bundle.
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For questions on prime twins.
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a card game with several variants (Draw, Texas Hold'em, ...), the common goal being to collect face value patterns such as "four of a kind", "full house" or "straight" or all of a suit ("flus…
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an exercise, often requiring little more than high school algebra for solution, but challenging in its translation from words to mathematical symbols and formulas. This tag is not a…
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Question on bits and pieces of mathematics that show up in popular media (TV, movies, comics, etc.)
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For questions about graphs with two sets of distinct vertices in which edges join vertices from different sets.
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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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For question on extrapolation, the process of estimating, beyond the original observation interval.
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An ordinary differential equation that generalizes the notion of "path of steepest descent." For questions on "gradients" of a function, use (multivariable-calculus) instead.
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In the philosophy of mathematics, intuitionism, or neointuitionism (opposed to preintuitionism), is an approach where mathematics is considered to be purely the result of the constructive mental activ…
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For questions about Coxeter groups, an abstract group that admits a formal description in terms of reflections.
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the property shared by many binary operations including group operations. For a binary operation $\cdot$, associativity holds if $(x\cdot y)\cdot z = x \cdot(y\cdot z)$.
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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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a computer algebra system distributed by the University of Sydney, and designed for solving problems in algebra, number theory, geometry and combinatorics.
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For questions about $\theta$ functions (special functions of several complex variables).
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For questions regarding the mathematical analysis of voting systems and behavior. Examples include the median voter theorem or the Condorcet jury theorems.
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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.