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 about delay differential equations.
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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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a particular form of optimization modeling that tends to be well-suited for combinatorial models like scheduling and planning.
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Isomorphisms between members of infinite families of mathematical objects (finite simple groups, Lie groups etc), that are not examples of a pattern of such isomorphisms.
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For questions related to the fractional part of a number.
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For questions related to Moebius inversion and its applications.
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For questions on the octonions, a normed division algebra over the real numbers. It is a non-associative higher-dimensional analogue in the hierarchy of real, complex, and quaternionic numbers.
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Questions about vector spaces equipped with a symplectic form, a non-degenerate, skew-symmetric bilinear form.
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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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a probability puzzle with a solution that is counterintuitive to many.
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For questions about the structure of product space, in the context of topology or measure theory for example. Use other tags to indicate the context.
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For questions about almost complex structures on vector spaces or manifolds.
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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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a field of mathematics which studies indexed families of binary operations, Hyperoperations families, that generalize and extend the standard sequence of the basic arithmetic operati…
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For questions regarding profinite groups and their properties.
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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 problems involving either the product of the first n primes or the product of all primes up to and including n.
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a regular, convex polyhedron with congruent faces of regular polygons and the same number of faces meeting at each vertex.
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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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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 about torsion groups and their properties. A torsion group is a group in which every element has finite order.
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typically defined to be without boundaries (every point has a neighbourhood homeomorphic to an Euclidean open disc). Use this tag for the manifolds with boundaries, as well as manifolds …
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Generalisation of (riemannian-geometry) where the metric is no longer required to be positive definite. The symmetry and non-degeneracy conditions are still kept. The particular case where the metric …