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 related to Inversive Geometry and its applications.
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Questions dealing with set-theoretic functions defined by transfinite recursion.
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For questions about topological graphs, flows, representation, planar, and book embeddings, geometric graphs, crossing numbers, coloring graphs, and other topics in topological graph theory.
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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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For questions about vector lattices (aka. Riesz spaces; a type of vector space equipped with a partial order), Banach lattices and similar topics.
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Questions about vector spaces equipped with a symplectic form, a non-degenerate, skew-symmetric bilinear form.
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The Ricci flow on a Riemannian manifold $(M,g)$ is determined by the geometric evolution equation $\partial_t g_{ij} = -2R_{ij}$ where $R_{ij}$ is the Ricci curvature. The Ricci flow is the main ingre…
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For questions on determining whether a number is rational, and related problems. If applicable, use this tag instead of (rational-numbers) and (irrational-numbers). Consider adding a tag (radicals) or…
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For questions about three-valued logic and other non-classical logics. Please use the more specific tags 'modal-logic' and 'fuzzy-logic' instead of this tag if they apply.
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For questions about the geometry, complex-analytic, and group-theoretic properties of the Möbius transformations (linear fractional transformations) $z \mapsto \frac{az + b}{cz + d}$ of the complex pl…
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For questions regarding profinite groups and their properties.
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For questions regarding the formal analysis of collective decision problems.
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For questions related to the fractional part of a number.
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Probabilistic methods prove existence results in a nonconstructive fashion, by showing the chance of randomly selecting a solution is greater than zero.
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For questions about the least common multiple of a collection of numbers (or more generally, elements of a commutative ring).
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Kolmogorov complexity concerns the size of the shortest program that generates a given string.
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Percolation theory describes the behavior of connected clusters in a random graph.
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For questions regarding the process, consequences, and stability of localizing algebraic structures such as rings, categories, and modules. Not for use with local topological spaces.
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For questions on Euler products, an expansion of a Dirichlet series into an infinite product indexed by prime numbers.
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If the expression obtained after any substitution during limit analysis does not give enough information to determine the original limit, it is known as an indeterminate form.
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a surface with only one side and only one boundary. The Möbius strip has the mathematical property of being non-orientable. It is named after the German mathematici…
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Questions about or involving perfect numbers which are positive integers that are equal to the sum of their proper positive divisors.
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a probability puzzle with a solution that is counterintuitive to many.
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For questions about Octave, a high-level interpreted language for numerical computations.