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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The operator $A^+$ which best approximates a solution to linear equations $Ax+b=0$ even if $A$ is singular.
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graphs obtained from a group $G$ in a such way that vertices are elements of the group and edges are added using some generating set $S\subseteq G$.
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For questions related to the fractional part of a number.
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For questions about or involving geometric series, a series where successive terms have a common ratio.
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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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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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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 regarding profinite groups and their properties.
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for questions pretaining to q-analogs of functions, for example q-Binomials, $q$-derivatives, the q-theta function, the q-Pochammer symbol, etc.
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Questions on the pronunciation of mathematical terms and notation.
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Percolation theory describes the behavior of connected clusters in a random graph.
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For questions about Octave, a high-level interpreted language for numerical computations.
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a functor from a category to itself together with two natural transformations, commonly called μ (the "multiplication") and η (the "unit"), satisfying conditions that make μ monoidal and η …
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For questions about mixing in ergodic or probability theory.
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the function space consisting of all continuous maps from the circle into a topological space; the function space is equipped with the compact-open topology. It is studied in …
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Kolmogorov complexity concerns the size of the shortest program that generates a given string.
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To be used with questions about continuous homomorphisms into a space carrying both a topological and an algebraic structure.
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A brief study of transcendental numbers and algebraic independence theories; currently an on-development branch of mathematics with a lot of open problems.
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Automatic proof checkers verify the validity of formal proofs, while proof assistants aid in the construction of formal proofs. Some popular systems: Mizar, Coq, Isabelle. For automated theorem prove…
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For questions concerning stability of equilibria and of other solutions of ordinary differential equations and their systems.
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Literally "together boundary", a cobordism is a relation between two compact manifolds stating that their disjoint union forms the boundary of a higher dimensional manifold. This defines a equivalence…
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Functional calculus allows the evaluation of a function applied to a linear operator or a matrix. The function could be a polynomial, a holomorphic function, a continuous function or a measurable func…
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said to be equidistributed, or uniformly distributed, if the proportion of terms falling in a subinterval is proportional to the length of that interval.
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For questions related to Moebius inversion and its applications.
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a probability puzzle with a solution that is counterintuitive to many.
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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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a regular, convex polyhedron with congruent faces of regular polygons and the same number of faces meeting at each vertex.