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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For questions concerning the open source computational software program Maxima.
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For questions pertaining to power towers: expressions like a^(b^(c^d))), which result from iterated exponentiation. The "hyperoperation" tag may be appropriate, too.
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a tool from homological algebra that defines a sequence of functors from rings to abelian groups. It has many applications in algebraic geometry. See also (topological-k-theory).
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For questions about Goldbach's conjecture: every even integer greater than two is the sum of two primes.
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an arrangement of $n^2$ numbers, usually distinct integers, in a square, such that the n numbers in all rows, all columns, and both diagonals sum to the same constant. ht…
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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 regarding the formal analysis of collective decision problems.
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For geometrical problems involving spheres. Use the tag (geometry) as well. For intrinsic geometry of spheres, see (spherical-geometry).
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Questions related to Inversive Geometry and its applications.
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For question about stereographic projection, a particular mapping that projects a sphere onto a plane.
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Questions dealing with set-theoretic functions defined by transfinite recursion.
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For questions on Gauss sums, a particular kind of finite sum of roots of unity.
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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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Mental arithmetic comprises arithmetical calculations using only the human brain, with no help from calculators, computers, or pen and paper.
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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 …
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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 torsion groups and their properties. A torsion group is a group in which every element has finite order.
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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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