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: 
hodgetheory× 179  characteristicp× 179 
teaching× 178
For questions related to teaching mathematics. For questions in Mathematics Education as a scientific discipline there is also the tag mathematicseducation.

birationalgeometry× 171 
manifolds× 171  approximationtheory× 170  stablehomotopy× 169  algebraicsurfaces× 167 
computationalgeometry× 164
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…

mathphilosophy× 161 
riemannzetafunction× 161
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…

hilbertspaces× 157 
randomwalk× 156  euclideangeometry× 154  monoidalcategories× 152 
textbookrecommendation× 151
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× 148 
computeralgebra× 147
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…

prooftheory× 146
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.

calculusofvariations× 143 
langlandsconjectures× 142
Higher reciprocity laws

convexoptimization× 141
Optimization with convex constraints and convex objectives; notions related to convex optimization such as subgradients, normal cones, separating hyperplanes

groupactions× 141  zetafunctions× 140 
homology× 139 
lfunctions× 138
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…

differentialoperators× 138
Elliptic, parabolic and hyperbolic operators. Laplace, LaplaceBeltrami, Schrödinger, Dirac. Exterior derivative and Lie derivative operators.

universalalgebra× 138
The study of algebraic structures and properties applying to large classes of such structures. For example, ideas from group theory and ring theory are extended and considered for structures with oth…

gm.generalmathematics× 135 
books× 134
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…

graphcolorings× 133  intersectiontheory× 130 
geometricmeasuretheory× 129  eigenvalues× 129  classfieldtheory× 129 
spectralgraphtheory× 127
Questions related to the spectrum of graphs, defined using one of the possible variants of the discrete Laplace operator or Laplacian matrix.
See https://en.wikipedia.org/wiki/Discrete_Laplace_oper…
