# 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:
 polynomials× 6755 expressions like $15x^3 - 14x^2 + 8$. Questions tagged with this concern common operations on polynomials, like adding, multiplying, polynomial long division, factoring and solving for… ring-theory× 6383 for questions about rings, which are a type of algebraic structure studied in abstract algebra and algebraic number theory. pde× 5807 Questions on "Partial Differential Equations", as opposed to "ordinary differential equations". algebraic-topology× 5801 Questions about algebraic methods and invariants to study and classify topological spaces: homotopy groups, (co)-homology groups, and beyond. proof-strategy× 5556 For questions about approaches and techniques for discovering a proof, as opposed to writing it down clearly (which involves (proof-writing)). Should not be used unless the focus is on the technique o… commutative-algebra× 5341 Questions about commutative rings, their ideals, and their modules. convergence× 5318 Convergence of sequences and different modes of convergence. optimization× 4986 the process of choosing the "best" value among possible values. They are often formulated as questions on the minimization/maximization of functions, with or without constraints. vector-spaces× 4872 For questions about vector spaces and their properties. More general questions about linear algebra belong under the [tag:linear-algebra] tag. A vector space is a space which consists of elements call… soft-question× 4789 For questions whose answers can't be objectively evaluated as correct or incorrect, but which are still relevant to this site. Please be specific about what you are after. definite-integrals× 4716 Questions about the evaluation of specific definite integrals. proof-verification× 4601 For questions concerning a specific proof, asking for verification, identifying errors, suggestions for improvement, etc. complex-numbers× 4513 Questions involving complex numbers, that is numbers of the form $a+bi$ where $i^2=-1$ and $a,b\in\mathbb{R}$. algorithms× 4439 Mathematical questions about Algorithms, including the analysis of algorithms, combinatorial algorithms, proofs of correctness, invariants, and semantic analyses. See also (computational-mathematics)… stochastic-processes× 4035 A stochastic, or random, process describes the correlation or evolution of random events. It is used to model stock market fluctuations and electronic/audio-visual/biological signals. Among the most w… metric-spaces× 4000 sets on which you can measure the "distance" between any two points. The distance measurement is generally required to be symmetric (so distance from $A$ to $B$ is the same as distan… summation× 3987 Questions about evaluating summations, especially finite summations. For infinite series, please consider the (sequences-and-series) tag instead. numerical-methods× 3957 Questions on numerical analysis/numerical methods; methods for approximately solving various problems that often do not admit exact solutions. finite-groups× 3955 refers to questions asked in the field of Group Theory which, in particular, focus on the groups of finite order. notation× 3770 Question on the meaning, history, and usage of mathematical symbols and notation. Please remember to mention where (book, paper, webpage, etc.) you encountered any mathematical notation you are asking… category-theory× 3687 studied in category theory using properties of objects and morphisms between them. Many constructions are special cases of categorical limits and colimits (e.g. products in var… field-theory× 3628 for questions about fields and field theory in abstract algebra. A field is, roughly speaking, an algebraic structure in which addition, subtraction, multiplication, and division of eleme… fourier-analysis× 3591 Fourier analysis, also known as spectral analysis, encompasses all sorts of Fourier expansions, including Fourier series, Fourier transform and the discrete Fourier transform (and relatives). The non-… prime-numbers× 3587 natural numbers not divisible by any smaller number other than 1. This tag is intended for questions about, related to, or involving prime numbers. proof-writing× 3495 For questions about the writing of proofs. But instead of focusing the mathematics behind the proof, these questions ask about the details and implementation of the proof. continuity× 3422 one where small changes of input result in correspondingly small changes of output. Use this tag for questions involving this concept. As there are many mathemati… eigenvalues-eigenvectors× 3224 numbers associated to a linear operator from a vector space $V$ to itself: $\lambda$ is an eigenvalue of $T\colon V\to V$ if the map $x\mapsto \lambda x-Tx$ is not injective. An eigenv… set-theory× 3031 for set theory topics typically studied at the advanced undergraduate or graduate level. These include cofinality, axioms of ZFC, axiom of choice, forcing, set-theoretic independence, larg… permutations× 2990 For questions related to permutations, which can be viewed as re-ordering a collection of objects. induction× 2829 For questions about mathematical induction, a method of mathematical proof. Mathematical induction generally proceeds by proving a statement for some integer, called the *base case*, and then proving… modular-arithmetic× 2781 a system of integer arithmetic based on the congruence relation $a \equiv b \pmod{n}$ which means that $n$ divides $b-a$. recurrence-relations× 2705 Questions regarding functions defined recursively, such as the Fibonacci sequence. terminology× 2698 Questions on the usage and meaning of words in mathematics, the names for mathematical entities, and other such questions. logarithms× 2687 Questions related to real and complex logarithms. modules× 2659 For questions about modules over rings, concerning either their properties in general or regarding specific cases. operator-theory× 2557 the branch of functional analysis that focuses on bounded linear operators, but it includes closed operators and nonlinear operators. Operator theory is also concerned with the stu…