# 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:
 descriptive-set-theory× 173 commutative-rings× 173 projective-geometry× 173 matrix-analysis× 171 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… approximation-theory× 165 stable-homotopy× 164 manifolds× 162 computational-geometry× 159 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… algebraic-surfaces× 158 birational-geometry× 158 math-philosophy× 158 euclidean-geometry× 149 computer-algebra× 148 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… hilbert-spaces× 148 random-walk× 148 riemann-zeta-function× 147 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… textbook-recommendation× 147 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… semigroups× 145 monoidal-categories× 145 proof-theory× 144 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. langlands-conjectures× 142 Higher reciprocity laws group-actions× 137 zeta-functions× 137 l-functions× 136 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… calculus-of-variations× 135 universal-algebra× 135 homology× 134 books× 133 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… gm.general-mathematics× 132 convex-optimization× 131 differential-operators× 130 Elliptic, parabolic and hyperbolic operators. Laplace, Laplace-Beltrami, Schrödinger, Dirac. Exterior derivative and Lie derivative operators. class-field-theory× 127 intersection-theory× 124 career× 123 graph-colorings× 123 permutations× 119 Questions related to permutations, bijections from a finite (or sometimes infinite) set to itself.