Tags
A tag is a keyword or label that categorizes your question with other, similar questions.
Questions about multigrid methods for numerically solving differential equations.
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A differential graded algebra is a graded algebra with an added chain complex structure that respects the algebra structure.
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Matrix completion is the task of filling in the missing entries of a partially observed matrix.
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Use this tag for questions related to boundary-layer theory, which refers to asymptotic approximations of solutions of boundary value problems for differential equations containing a small parameter in front of the highest derivative in sub-regions where there is a substantial effect from terms containing the highest derivatives on the solution.
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In proof theory, ordinal analysis assigns ordinals to mathematical theories as a measure of their strength. If theories have the same proof-theoretic ordinal they are often equiconsistent, and if one theory has a larger proof-theoretic ordinal than another it can often prove the consistency of the second theory.
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This tag is for questions relating to "geometric functional analysis", lies at the interface of convex geometry, functional analysis and probability. It has numerous applications ranging from geometry of numbers and random matrices in pure mathematics to geometric tomography and signal processing in engineering and numerical optimization and learning theory in computer science.
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For questions related to contraction mapping. On a metric space $(M, d)$ it is a function $f$ from $M$ to itself, with the property that there is some real number $0\leq k<1$ such that for all $x$ and $y$ in $M$, $d(f(x),f(y))\leq k\,d(x,y)$.
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A numeral system with 3 as the base. The usual decimal system uses 10 and binary uses 2. If we specify that the representation be non-terminating, each real number can be represented uniquely.
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Presburger arithmetic is the first-order theory of the natural numbers with addition.
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For questions about osculating-circles, Descartes Theorem, Radius of Curvature, and evolutes.
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A limit cycle is a closed trajectory in state space such that at least one other trajectory spirals into it or spirals out of it
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For questions about left, right and absolute Kan extensions from category theory. Use in conjunction with the tag (category-theory).
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For questions on Jacobi symbols, a generalization of the Legendre symbol introduced by Jacobi in 1837.
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Finsler geometry is a metric generalization of Riemannian geometry, where the general definition of the length of a vector is not necessarily given in the form of the square root of a quadratic form as in the Riemannian case.
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For all question related to the decreasing rearrangements of measurable functions so for measurable set too. As well the Lorentz spaces are strongly include since there are exclusively defined through the decreasing rearrangement of function. The analogue of this notion higher dimension is: The **spherical (or symmetric, or radial)** decreasing rearrangement of a measurable function
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For questions related to coproduct. In category theory, the coproduct, or categorical sum, is a construction which includes as examples the disjoint union of sets and of topological spaces, the free product of groups, and the direct sum of modules and vector spaces.
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Questions about the Brownian Bridge stochastic process, which is Brownian Motion conditioned to have specific values at two endpoints, most commonly defined as starting and returning to 0, or starting at 0 and arriving at 1.
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Arithmetic dynamics combines the study of dynamical systems with number theory.
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For questions related to alternating expression (or series). It is a sequence, whose terms change sign (i.e. if a term $a_n$ is positive then $a_{n+1}$ is negative and vice versa).
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Questions involving split complex numbers, that is numbers of the form $a+bj$ where $j^2=1,j\ne\pm 1$ and $a,b\in\mathbb{R}$.
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A Point cloud represents a set of data points in space, generally produced by 3D scanners, and used in CAD models, metrology, animation, etc.
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For any and all mathematics pertinent to collegiate, scholarly, or any other academic lecture notes.
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Subgroup growth is a branch of group theory, dealing with quantitative questions about subgroups of a given group.
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For questions about Pfaffians of skew-symmetric matrices, $\det(A)=\operatorname{pf}(A)^2$.
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Questions related to majorization include questions on the majorization inequality (Karamata's Inequality), Muirhead's inequality, Schur-convex functions and etc.; As well as the questions on its generalizations or weaker concepts such as dominance order.
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This tag is for questions related to Jordan algebras. They constitute one of the first classes of non-associative algebras.
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A square matrix $A$ is a Hurwitz matrix if all eigenvalues of $A$ have strictly negative real parts.
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Hankel matrix (or catalecticant matrix), is a square matrix in which each ascending skew-diagonal from left to right is constant. The [Hilbert matrix](https://math.stackexchange.com/questions/tagged/hilbert-matrices) is an example of a Hankel matrix.
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Equivariant topology is the study of topological spaces that possess certain symmetries. In studying topological spaces, one often considers continuous maps, and while equivariant topology also considers such maps, there is the additional constraint that each map "respects symmetry", in the sense of preserving action of a group on the space.
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Use this tag for questions about rules for decomposing the restriction of an irreducible representation of a group into irreducible representations of a subgroup.
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Use this tag for questions related to algebraic vector bundles, which are morphism of varieties $E \to X$ that locally (in the Zariski topology) have the structure of a projection of a direct product $k^n × X$ onto $X$ such that the gluing preserves the linear structure of the vector space.
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