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: 
characteristicp× 184 
teaching× 182
For questions related to teaching mathematics. For questions in Mathematics Education as a scientific discipline there is also the tag mathematicseducation.

approximationtheory× 180  hodgetheory× 180 
birationalgeometry× 177  stablehomotopy× 174 
computationalgeometry× 173
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…

manifolds× 173 
algebraicsurfaces× 171 
hilbertspaces× 168
a real or complex vector space endowed with an inner product such that $H$ is a complete metric space when endowed with the norm induced by this inner product.

mathphilosophy× 164  randomwalk× 163 
riemannzetafunction× 163
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…

euclideangeometry× 161  monoidalcategories× 157 
convexoptimization× 156
Optimization with convex constraints and convex objectives; notions related to convex optimization such as subgradients, normal cones, separating hyperplanes

textbookrecommendation× 155
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…

calculusofvariations× 151  semigroups× 151 
computeralgebra× 150
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…

groupactions× 150 
prooftheory× 147
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.

differentialoperators× 146
Elliptic, parabolic and hyperbolic operators. Laplace, LaplaceBeltrami, Schrödinger, Dirac. Exterior derivative and Lie derivative operators.

lfunctions× 145
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…

langlandsconjectures× 142
Higher reciprocity laws

zetafunctions× 142 
universalalgebra× 141
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…

homology× 140 
gm.generalmathematics× 139  graphcolorings× 138 
spectralgraphtheory× 138
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…

eigenvalues× 136 
books× 135
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…

intersectiontheory× 135  planegeometry× 135  classfieldtheory× 134 