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 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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Combinatorial proofs of identities use double counting and combinatorial characterizations of binomial coefficients, powers, factorials etc. They avoid complicated algebraic manipulations.
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For questions about Combinatorial design theory, a part of combinatorial mathematics that deals with the existence, construction and properties of systems of finite sets whose arrangements satisfy gen…
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a generalization of a sequence where a directed set is used as the index set instead of positive integers. Convergence of nets can be defined in a similar way as convergence of sequences. …
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For questions about algebras, their properties, and their structures.
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A method of obtaining (numerically) approximate solutions to (usually) differential equations. It consists of a method of discretization splitting the domain into disjoint subdomains over each of whic…
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For questions about $\theta$ functions.
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A tag for all questions involving a type of utility function.
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A path in a graph that visits each vertex exactly once.
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For questions regarding the structure and properties of compact manifolds.
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Question on minimal surfaces, or surfaces that have zero mean curvature.
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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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Questions about mathematicians and their lives.
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In number theory, a multiplicative function is a function defined on positive integers such that f(ab)=f(a)f(b) for a,b coprime. E.g. Euler's totient function, sum of divisors and number of divisor…
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For questions on prime twins.
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For questions about or related to polylogarithm functions.
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The splitting field of a polynomial with coefficients in a field, F, is the smallest field extension to F such that the polynomial decomposes into linear factors. Often used with Galois-theory tag.
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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 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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For questions about Legendre polynomials, which are solutions to a particular differential equation that frequently arises in physics.
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Question on bits and pieces of mathematics that show up in popular media (TV, movies, comics, etc.)