Tags
A tag is a keyword or label that categorizes your question with other, similar questions.
For questions on the adjoint action of a Lie group $G$, which represents the elements of the group as linear transformations of the group's Lie algebra, considered as a vector space.
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The tag is meant to be used for any question related to the mathematics of sporadic groups.
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A power automorphism of a group is an automorphism that takes each subgroup of the group to within itself.
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For questions regarding imprecise probability, which concerns concepts and methods generalizing probability theory beyond real-valued probability measures. It includes extensions of Bayesian methods to reflect uncertainty in degrees of confidence, and covers among other things, upper and lower previsions, interval-valued probability, credal sets, lower envelopes, and Choquet capacities.
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For questions related to hypercone (or spherical cone). It's a $4$D Euclidean space represented by the equation $x^{2}+y^{2}+z^{2}-w^{2}=0$.
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For questions about the half-normal distribution. It's a non-negative distribution based on the normal distribution.
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A fusion system of a $p$-group $P$ is the category of subgroups of $P$ and injective group homomorphisms induced by conjugation in $P$. Example topics include control of fusion, blocks, centric and radical subgroups, subsystems and quotients, Alperin's fusion theorem, and normal fusion systems.
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For questions related to dominant morphisms. A morphism $f:X→S$ of schemes is called dominant if the image of $f$ is a dense subset of $S$.
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Use for anything related to Judea Pearl's do calculus, in which a quantity of primary interest is a probability of the form $P(x|\operatorname{do}(y)),$ involving the $\operatorname{do}$ operator. Related topics include the back-door criterion, back-door adjustment formula, front-door adjustment formula.
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Use this tag for a general type of quadratic variation of two stochastic processes.
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For questions related to wheel theory. A wheel is a type of algebra (in the sense of universal algebra) where division is always defined. In particular, division by zero is meaningful. The real numbers can be extended to a wheel, as can any commutative ring.
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For questions regarding Ramanujan's master theorem. See https://en.wikipedia.org/wiki/Ramanujan%27s_master_theorem
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The Nichols algebra of a braided vector space is a braided Hopf algebra named after the mathematician Warren Nichols. It takes the role of quantum Borel part of a pointed Hopf algebra.
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Herstein's theory is the study of the nonassociative structures and objects arising from associative rings
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For questions related to directed union. Directed union of set $H_i$($i∈I$) is defined as union of $H_i$ where for all $i,j∈I$,$\ i \geq j$ implies $H_i \supseteq H_j$.
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For questions about co-hopfian groups, rings, modules, etc. Namely, objects which are not isomorphic to any proper subobject.
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For questions related to Penrose graphical notation (or tensor diagram notation). It is a (usually handwritten) visual depiction of multilinear functions or tensors. A diagram in the notation consists of several shapes linked together by lines.
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