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: 
descriptivesettheory× 173  commutativerings× 173  projectivegeometry× 173 
matrixanalysis× 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…

approximationtheory× 165  stablehomotopy× 164  manifolds× 162 
computationalgeometry× 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.algebraicgeometry or mg.metr…

algebraicsurfaces× 158  birationalgeometry× 158  mathphilosophy× 158  euclideangeometry× 149 
computeralgebra× 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.commutativealgeb…

hilbertspaces× 148  randomwalk× 148 
riemannzetafunction× 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…

textbookrecommendation× 147
Questions asking for recommendations of textbooks on some subject. It can be helpful to indicate whether the request is for selfstudy, for use in a course one teaches, for use accompanying a course o…

semigroups× 145  monoidalcategories× 145 
prooftheory× 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.

langlandsconjectures× 142
Higher reciprocity laws

groupactions× 137  zetafunctions× 137 
lfunctions× 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 Lfuncti…

calculusofvariations× 135  universalalgebra× 135  homology× 134 
books× 133
Questions in which books play a keyrole, such as questions on antique books, ebooks, difference between various editions of a book, etc. For questions asking for recommendations of books on some sub…

gm.generalmathematics× 132  convexoptimization× 131 
differentialoperators× 130
Elliptic, parabolic and hyperbolic operators. Laplace, LaplaceBeltrami, Schrödinger, Dirac. Exterior derivative and Lie derivative operators.

classfieldtheory× 127 
intersectiontheory× 124  career× 123  graphcolorings× 123 
permutations× 119
Questions related to permutations, bijections from a finite (or sometimes infinite) set to itself.
