Tags

A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

 Type to find tags:
 injective-module× 119 injective if $\hom_{R}({-},I)$ is exact. The notion of injective modules is dual to the notion of a projective module. In homological algebra injective modules are used… uniform-spaces× 119 In the mathematical field of topology, a uniform space is a set with a uniform structure. (Def: http://en.m.wikipedia.org/wiki/Uniform_space) kinematics× 117 pseudoinverse× 117 The operator which best approximates a solution to a linear system with a singular (non-invertible) matrix.: e.g., the Moore-Penrose pseudoinverse. Use when a question concerns a matrix that is probab… cantor-set× 116 Questions concerning the Cantor set, which consists of those real numbers in [0,1] that remain after repeatedly removing the open middle third of every interval; it contains those numbers which may be… stationary-processes× 116 For questions about strictly stationary or stationary in the wide sense sequences or processes. Questions about deterministic stationary processes (in the case of discrete dynamical systems) are welco… bifurcation× 115 the mathematical study of changes in the qualitative or topological structure of a given family, such as the integral curves of a family of vector fields, and the solutions of a … associativity× 115 the property shared by many binary operations including group operations. For a binary operation $\cdot$, associativity holds if $(x\cdot y)\cdot z = x \cdot(y\cdot z)$. prime-twins× 115 For questions on prime twins. initial-value-problems× 115 about questions regarding Initial value problems. In the field of differential equations, an initial value problem is an ordinary differential equation together with a specified value, cal… limits-colimits× 114 For questions about categorical limits and colimits. universal-property× 114 pell-type-equations× 113 Questions on finding integer solutions to bivariate equations of the form $x^2-Dy^2=a$. monotone-functions× 112 In mathematics, a monotonic function (or monotone function) is a function between ordered sets that preserves or reverses the given order. This concept first arose in calculus, and was later generaliz… hash-function× 112 For questions about hash functions: functions from a big set to a smaller one such that the same output $f(x_1)=f(x_2)$ for different input $x_1\ne x_2$ is unlikely, especially if $x_2$ differs from $… abelian-varieties× 112 In mathematics, particularly in algebraic geometry, complex analysis and number theory, an abelian variety is a projective algebraic variety that is also an algebraic group, i.e., has a group law that… coherent-sheaves× 111 In mathematics, especially in algebraic geometry and the theory of complex manifolds, coherent sheaves are a specific class of sheaves having particularly manageable properties closely linked to the g… greens-theorem× 111 for questions about Green's theorem. Green's theorem gives the relationship between a line integral around a simple closed curve$C$and a double integral over the plane region$D$bounded… orientation× 111 For question regarding the notion of orientation both in topology and in global analysis. projective-schemes× 110 ceiling-function× 110 The function that maps a real number$x$to the smallest integer greater than or equal to$x$(which is often denoted$\lceil x\rceil\$. See also (floor-function). convex-geometry× 110 when posting questions related to the concept of convexity and geometry. For example, for convex polygons. big-numbers× 110 For questions relating to the computation, estimation and properties of extremely large quantities that are not usually used in mainstream mathematics. graded-modules× 110 regularization× 110 Regularization, in mathematics and statistics and particularly in the fields of machine learning and inverse problems, refers to a process of introducing additional information in order to solve an il… sage× 109 For questions concerning the mathematical software system SageMath. Consider whether your question would be a better fit at [ask SageMath](http://ask.sagemath.org/). formal-grammar× 109 In formal language theory, a grammar (when the context is not given, often called a formal grammar for clarity) is a set of production rules for strings in a formal language. A formal grammar is a set… borel-cantelli-lemmas× 107 For questions involving the Borel-Cantelli Lemma or the second Borel-Cantelli Lemma. Use this tag along with (probability-theory), (real-analysis) or (measure-theory) algorithmic-game-theory× 106 an area in the intersection of game theory and algorithm design, whose objective is to design algorithms in strategic environments. (Def: http://en.m.wikipedia.org/wiki/Al… geometric-algebras× 106 Clifford algebras over the real numbers. They are applied in geometry and theoretical physics. meta-math× 106 the term for the theory in which mathematics is formalized (often PA, ZFC or similar theories). Meta-mathematical statements are statements which are evaluated at the level of the meta-… unit-of-measure× 106 For questions related to conversion of units. z-transform× 106 a discrete analogue to the Laplace transform, in that it maps a time domain signal into a representation in complex frequency plane. schwartz-space× 105 For question about the Schwartz space, a vector space of smooth functions stable under the Fourier transform. semidefinite-programming× 105 for questions regarding semidefinite programming (SDP) which is a subfield of convex optimization concerned with the optimization of a linear objective function (an objective function is a… karush-kuhn-tucker× 105 In mathematical optimization, the Karush–Kuhn–Tucker (KKT) conditions are first order necessary conditions for a solution in nonlinear programming to be optimal, provided that some regularity conditio…