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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Questions on spherical harmonics, a set of basis functions that satisfy an orthogonality relation over the sphere.
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the term for the theory in which mathematics is formalized (often PA, ZFC or similar theories). Meta-mathematical statements are statements which are evaluated at the level of the meta-…
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For questions about mathematical constants, that are "significantly interesting in some way".
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For questions on or pertaining to Latin squares.
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For questions about or related to the Krull dimension.
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For questions about hash functions: functions from a big set to a smaller one such that the same output $f(x_1)=f(x_2)$ for different input $x_1\ne x_2$ is unlikely, especially if $x_2$ differs from $…
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grouping (partitioning) a set of objects so that items in the same group are more similar to each other than to items in different groups, where the notion of similarity may be variously…
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(STUB) A method of computing homology groups by taking a sequence of approximations. Particularly useful in algebraic topology.
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a generalized cohomology theory, for which $K_0(X)$ is the Grothendieck group of isomorphism classes of vector bundles over topological space $X$. See also [tag:algebraic-k-the…
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For questions about families of uniformly integrable random variables. Use the tags [tag: measure-theory] or [tag: probablity-theory].
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a study of noncomutative algebras from geometrical point of view. The motivation of this approach is Gelfand representation theorem, which shows that every commutative C*-al…
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For questions regarding harmonic numbers, which are partial sums of the harmonic series.
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For questions on dihedral groups, the group of symmetries of a regular polygon, including both rotations and reflections
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Sieve theory deals with number theoretic sieves, and sifted sets. E.g. the Sieve of Eratosthenes, Brun sieve, and other modern sives.
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For questions on propagation of errors.
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Clifford algebras over the real numbers. They are applied in geometry and theoretical physics.
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For questions related to the Lambert-W or product log function. This is the inverse function of $f(z) = ze^z$.
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For questions regarding formal decision problems. In contrast, questions involving strategic aspects (where the solution depends on the behavior of others) are discussed in game theory.
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For questions related to multinomial coefficients, a generalization of binomial coefficients.
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For questions concerning Sage. Consider whether your question would be a better fit at [ask Sage](http://ask.sagemath.org/).
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