Tags
A tag is a keyword or label that categorizes your question with other, similar questions.
To use when our aim is to solve an ODE (of any order) only with reduction of order method. If you just want to solve an ODE use the tag differential-equations.
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For questions related to integer sequences (i.e. an ordered list of integers).
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Domain theory is a branch of order theory that studies partially ordered sets which are called domains. Do not use this tag for questions about the domain of a function.
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For questions about the structure and properties of a divisible group, which are Abelian groups in which one can "divide" by positive integers.
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Used for questions related to conformal field theory, which is a quantum field theory that is invariant under conformal transformations.
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Use this tag for questions about composite numbers n that satisfy b^(n-1) ≡ 1 (mod n) for all integers b relatively prime to n.
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Questions on partial functions, history, usage, properties, significance for computability theory, connections to (inverse)-semi-groups and other algebraic theories.
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A generalized inverse of a matrix $A$ is any matrix $A^{-}$ satisfying $AA^{-}A = A$. When $A$ is nonsingular, $A^{-}$ is unique and $A^{-} = A^{-1}$; otherwise, there are infinitely many solutions to $A^{-}$. Generalized inverses arise in linear models for statistics, for when the design matrix of a linear model is not invertible and the ordinary least squares estimate of the parameter vector is not unique.
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A continuous mapping that satisfies the homotopy extension property with respect to all spaces.
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This tag is for questions relating to Weierstrass factorization theorem, an extension of the fundamental theorem of algebra.
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A sesquilinear form is a modification of a [tag:bilinear-form], where it allows one of its arguments to be "twisted" in a [tag:semilinear] manner.
One of its applications is when taking the inner product of two complex vectors. It guarantees the the result is a real number by twisting the linearity of one of the arguments by taking its complex conjugate and then performing a standard inner product with the other argument.
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A quadratically constrained linear program (QCLP) is an optimization problem in which the objective function is linear and the constraints are quadratic.
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An irreducible representation of a group is a group representation that has no nontrivial invariant subspaces.
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Global optimization is a branch of applied mathematics and numerical analysis that attempts to find the global minima or maxima of a function or a set of functions on a given set.
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Use this tag for questions about sequence transformations for improving the rate of convergence of a series.
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For questions related to the so called quantile function of a cumulative distribution function or generalized inverse of a cumulative distribution function.
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A double sequence is a map from $\mathbb{N}\times \mathbb{N}$ into a space; for instance, a double real sequence $(a_{ij})$ is a map $a:\mathbb{N}\times\mathbb{N}\to \mathbb{R}$. As with the single-variable case, the notation $\{a_{ij}\}$ is also common.
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Combinatory logic, combinatorial calculi, and other questions about combinators and variable-free variants of the $\lambda$-calculus.
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For questions about Brauer groups; in mathematics, the Brauer group of a field $K$ is an abelian group whose elements are Morita equivalence classes of central simple algebras over $K$, with addition given by the tensor product of algebras.
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A given set is (positively) invariant with respect to a given dynamical system if the following property holds: whenever the initial state is in the set, the state remains in the set thereafter.
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Nonarchimedean analysis studies the properties of convergence in spaces that do not satisfy the Archimedean property. Examples of such spaces include the $p$-adic numbers and hyperreal and surreal numbers.
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For questions related to German translations of mathematical texts and reference requests for German texts.
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A homothety is a transformation of an affine space determined by a point $S$ called its center and a nonzero number $\lambda$ called its ratio, which fixes $S$, and sends each $M$ to another point $N$ such that the segment $SN$ is on the same line as $SM$, but scaled by a factor $ \lambda $.
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Dirichlet characters appear in Dirichlet $L$-functions, in Gauss sums, and in other arithmetical generating functions. They are not exactly group characters, but are extensions by $0$ of such.
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Questions related to mathematical procedures and concepts involved with the study and practice of making maps.
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Arithmetic combinatorics is the study of combinatorial estimates associated with arithmetic operations. It lies in the intersection of harmonic analysis, combinatorics, ergodic theory, and number theory. This tag is for questions related to arithmetic combinatorics.
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Use this tag for questions related to almost periodic functions, which are functions of a real number that are periodic to within any desired level of accuracy given suitably long, well-distributed "almost-periods".
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Infinite descent, also named Fermat's descent, is a technique to prove that a diophantine equation has no solutions by construction a 'smaller' solution from a given one.
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