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 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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Questions related to Inversive Geometry and its applications.
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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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The concept of regularity concerns the smoothness of weak solutions to partial differential equations.
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For question about stereographic projection, a particular mapping that projects a sphere onto a plane.
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For questions on Gauss sums, a particular kind of finite sum of roots of unity.
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The spectrum of a commutative ring as the space of prime ideals with Zariski topology, but augments it with a sheaf of rings: to every Zariski-open set he assigns a commutative ring, thought of as the…
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For questions related to theory of semigroups of linear operators and its applications to partial differential equations, stochastic processes such as Markov processes and other branches of mathematic…
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Questions about vector spaces equipped with a symplectic form, a non-degenerate, skew-symmetric bilinear form.
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Questions dealing with set-theoretic functions defined by transfinite recursion.
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For questions regarding the formal analysis of collective decision problems.
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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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For questions about Octave, a high-level interpreted language for numerical computations.
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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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a particular form of optimization modeling that tends to be well-suited for combinatorial models like scheduling and planning.
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