# 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:
 motives× 138 algebraic-surfaces× 133 stable-homotopy× 131 approximation-theory× 129 computer-algebra× 129 Using computers to solve algebraic problems. Questions with this tag should typically include at least one other tag indicating what sort of algebraic problem is involved, such as ac.commutative-algeb… books× 127 Questions in which books play a key-role, such as questions on antique books, e-books, difference between various editions of a book, etc. For questions asking for recommendations of books on some sub… random-walk× 127 proof-theory× 126 For question in Proof Theory, where "proofs" themselves are the object of mathematical investigation. It is not to be used to request a proof of some result. computational-geometry× 126 Using computers to solve geometric problems. Questions with this tag should typically have at least one other tag indicating what sort of geometry is involved, such as ag.algebraic-geometry or mg.metr… textbook-recommendation× 124 Questions asking for recommendations of textbooks on some subject. It can be helpful to indicate whether the request is for self-study, for use in a course one teaches, for use accompanying a course o… zeta-functions× 121 hilbert-spaces× 121 matrix-analysis× 121 The study of real and complex matrices and their algebraic and analytical properties, including: eigenvalues and eigenvectors, positive definite matrices, matrix inequalities, invariant subspaces, per… gm.general-mathematics× 120 sobolev-spaces× 119 monoidal-categories× 118 career× 118 langlands-conjectures× 117 Higher reciprocity laws homology× 116 euclidean-geometry× 115 elliptic-pde× 113 Questions about partial differential equations of elliptic type. Often used in combination with the top-level tag ap.analysis-of-pdes. semigroups× 113 universal-algebra× 112 riemann-zeta-function× 111 the function of one complex variable $s$ defined by the series $\zeta(s) = \sum_{n \geq 1} \frac{1}{n^s}$ when $\operatorname{Re}(s)>1$. It admits a meromorphic continuati… intersection-theory× 110 calculus-of-variations× 110 birational-geometry× 110 operator-theory× 107 Spectrum, resolvent, numerical range, functional calculus, operator semigroups. Special classes of operators: compact, Fredholm, dissipative, differential, integral, pseudodifferential, etc. linear-programming× 106 class-field-theory× 106 diophantine-approximation× 104 notation× 104 l-functions× 103 Questions about generalizations of the Riemann Zeta function of arithmetic interest whose definition relies on meromorphic continuation of special kinds of Dirichlet series, such as Dirichlet L-functi… permutations× 102 group-actions× 102 advice× 99