Tags
A tag is a keyword or label that categorizes your question with other, similar questions.
Use this tag for questions related to canonical transformations, which are changes of canonical coordinates that preserve the form of Hamilton's equations.
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For questions about Pólya counting theorem. AKA Pólya enumeration theorem, Redfield–Pólya theorem, Pólya counting.
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This tag is for questions relating to truncation error, which is the difference between the true (analytical) derivative of a function and its derivative obtained by numerical approximation.
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Questions related to the work and continuation of Oswald Teichmüller on Teichmüller theory, especially Teichmüller spaces.
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This tag is for the resultant of polynomials, which detects when two polynomials have a common factor.
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For questions about paracompact spaces and partitions of unity, as well as variants such as metacompact spaces
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This tag is for questions relating to Modular Function or, Elliptic Modular Function.
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A hypercomplex number is an element of a finite-dimensional algebra over the real numbers that is unital and distributive (but not necessarily associative).
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For questions about Chebyshev functions $\vartheta(x)$ and $\psi(x)$, which are often used in number theory. For questions about Chebyshev polynomials, use the (chebyshev-polynomials) tag.
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For questions about definite integrals $\int_a^b f(x)\,dx$ where the integrand is oscillating, often of the form $f(x) =g(x) e^{i h(x)}$.
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Diophantine equation where the variable is in the exponent (ex.: find all sols for $3^x-5^y=7$)
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This tag is for questions regarding Parseval's Identity, an important result in the study of Fourier Series.
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Ordered sets have a natural topology generated by the open intervals. This tag is meant for questions about this topology.
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Questions about mathematicians and their lives. Consider whether the History of Science and Mathematics StackExchange at http://hsm.stackexchange.com/ would be a more appropriate place to ask your question.
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For questions about Cayley tables, a table that describes the structure of a finite group by arranging all the possible products of all the group's elements in a square table reminiscent of an addition or multiplication table.
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A Weyl Group is a group associated with a compact Lie group that can either be abstractly defined in terms of a root system or in terms of a maximal torus. More generally, there are Weyl groups associated with symmetric spaces. They can also be viewed as a special type of finite Coxeter group, i.e. a group generated by reflections which, in the case of Weyl groups, acts discretely by isometries on a sphere in some dimension.
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For questions from continuum theory. A continuum is a compact connected metric space (sometimes this term is used for a compact connected Hausdorff space). Do not use this tag for questions related to the Continuum Hypothesis in Set Theory.
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Use for questions related to Voronoi diagram, such as computing its edges.
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For questions concerning the open source computational software program Maxima.
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Use this tag for questions about division rings in abstract algebra and/or noncommutative algebra.
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For questions related to dense subspaces. In general topological spaces, a dense set is one whose intersection with any nonempty open set is nonempty.
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Use this tag for questions about graphs or models of decisions and their possible consequences including chance-event outcomes, resource costs, and utility.
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The notion of a [$2$-category](https://en.wikipedia.org/wiki/Strict_2-category) generalizes that of category by considering "morphisms between morphisms". In other words, it is a category enriched over $\mathbf{Cat}.$
It generalizes further in higher category theory to $n$-categories, which have $k$-morphisms for all $k\le n.$ However this should not confused with the (related) notion of [double categories.](https://ncatlab.org/nlab/show/double+category)
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This is a tag used for number-theoretical questions with combinatorial flavor.
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Surgery refers to cutting out parts
of the manifold and replacing it with a part of another manifold, matching up along the cut or boundary. This is
closely related to, but not identical with, handlebody decompositions. It is a major tool in the study and
classification of manifolds of dimension greater than 4.
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For questions about string theory, which is a research framework in theoretical physics and mathematical physics that attempts to unify quantum theories and general relativity.
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Given two vectors $\vec{u},\vec{v}$ of dimensions $m,n$ respectively, their outer product $\vec{u}\otimes \vec{v}$ is the $m\times n$ matrix $M$ with entries $m_{ij}=u_i v_j$.
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In the study of metric spaces in mathematics, there are various notions of two metrics on the same underlying space being "the same", or equivalent.
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To be used with questions about continuous homomorphisms into a space carrying both a topological and an algebraic structure.
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The theory of elliptic curves with large endomorphism rings. For questions on multiplication of complex numbers, use (complex-numbers) instead.
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