Tags
A tag is a keyword or label that categorizes your question with other, similar questions.
In mathematics, a Hadamard matrix, named after the French mathematician Jacques Hadamard, is a square matrix whose entries are either $+1$ or $−1$ and whose rows are mutually orthogonal.
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The study of fractional self-iterations of a map. A basic example is the analysis of functional square roots of a map $g$, i.e. solutions $f$ to the functional equation $f\circ f=g$ are functional square roots and solutions to $f^n=g$ are functional nnth roots.
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Banach lattices are Banach spaces endowed with a partial ordering that is compatible with the norm.
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Use this tag for questions related to art and mathematics, the applications of mathematics in art, or vice versa.
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Use this tag for questions related to reasoning obtained by manipulating equations with free variables.
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For questions involving the forgetful functor, the functor that drops some of the properties of the input structure before mapping to the output.
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Use this tag for questions about approximate probability distributions for functions of an asymptotically normal statistical estimator from knowledge of the limiting variance of that estimator.
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A cryptarithm is a numeric puzzle in which a mathematical equation is given where the digits are replaced by letters, the object being to recover the original equation. The canonical example is SEND + MORE = MONEY, which has the unique solution 9567 + 1085 = 10652. There are variants, such as long division problems where most of the digits are replaced by asterisks.
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In category theory, a category is cartesian closed if it has products and the induced monoidal structure is closed, i.e. for every object the functor defined by taking the product with this object has a right adjoint; this is equivalent to the category having exponential objects. Use this tag alongside [tag:category-theory].
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In algebraic geometry, the scheme that represents the Picard functor and the natural generalisation of the Picard variety for a given algebraic variety to the theory of schemes. If your question is not about algebraic or arithmetic geometry, then this is likely not the right tag to use.
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A function on square matrices which can be given as a polynomial of the matrix entries. A special case of the "immanant" of a matrix. Used primarily in combinatorics, graph theory, and quantum field theory.
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For questions about locales, a generalization of topological spaces which need not have points. Their study is called pointless or point-free topology. They are related with lattice-theoretic structures such as frames, Heyting algebras, Boolean algebras as well as topos theory. Use in conjunction with those tags as necessary.
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The Liouville-Roth irrationality measure of a real number $x$ is a measure of how "closely" it can be approximated by rationals.
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This tag is for the questions relating to Heisenberg group (or Weyl-Heisenberg group) which is a Lie group integrating a Heisenberg Lie algebra. It is another illustration of its perception as an extraneous object: physicists call it by the name of a mathematician, and mathematicians by the name of a physicists.
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CVX is a popular modeling framework for disciplined convex programming that CVX turns MATLAB into a modeling language, allowing constraints and objectives to be specified using standard MATLAB expression syntax.
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This tag is for questions regarding to computational number theory, the branch of number theory concerned with finding and implementing efficient computer algorithms for solving various problems in number theory.
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Radial Basis Functions (RBFs) are commonly used for interpolating scattered data, in numerical meshfree simulation methods, and in artificial neural networks
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Use for questions about mirror symmetry in theoretical/mathematical physics. Associate with [tag:mathematical-physics] if necessary.
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Use this tag to describe mathematics questions dealing with the knight's tour problem. A knight's tour is a series of legal knight moves in chess that visits all of the squares on the board exactly once.
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For questions regarding the definition, properties and types of the Kac-Moody algebras.
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The soliton-theory tag is for any questions regarding exactly solvable nonlinear PDE's such as Korteweg-De Vries, nonlinear Schrödinger, Sine-Gordon, etc. Other important related concepts are the Lax Pair, the AKNS Scheme, the Inverse Scattering Transform, the Gel'fand-Levitan-Marchenko equation, and the scattering data.
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The power of a point $P$ with respect to a circle centered at $O$ is a measure of distance from the point to the circle, defined by $h = OP^2 - r^2$.
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For questions related to mathematical models to study the size and age composition of populations as dynamical systems.
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Questions related to memory devices that help learners recall larger pieces of information, especially in the form of lists like characteristics, steps, stages, parts.
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For questions about morphisms of algebraic groups (group varieties) that are surjective and have a finite kernel.
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Univalent foundations are an approach to the foundations of mathematics in which mathematical structures are built out of objects called types.
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For questions about the transfer homomorphism in group theory and its applications.
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For questions concerning pro-$p$ groups. These groups arise naturally in topology, algebraic number theory or Galois theory and are a special case of pro-finite groups.
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