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: 
computationalgeometry× 185
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…

markovchains× 185  motives× 185 
teaching× 184
For questions related to teaching mathematics. For questions in Mathematics Education as a scientific discipline there is also the tag mathematicseducation.

hodgetheory× 183  birationalgeometry× 181  stablehomotopy× 178  manifolds× 175 
algebraicsurfaces× 173  euclideangeometry× 172 
hilbertspaces× 171
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.

randomwalk× 167 
riemannzetafunction× 166
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…

mathphilosophy× 165 
convexoptimization× 161
Optimization with convex constraints and convex objectives; notions related to convex optimization such as subgradients, normal cones, separating hyperplanes

textbookrecommendation× 161
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…

monoidalcategories× 160  calculusofvariations× 152 
computeralgebra× 151
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× 151 
lfunctions× 150
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…

semigroups× 150 
prooftheory× 150
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× 149
Elliptic, parabolic and hyperbolic operators. Laplace, LaplaceBeltrami, Schrödinger, Dirac. Exterior derivative and Lie derivative operators.

langlandsconjectures× 144
Higher reciprocity laws

zetafunctions× 144  homology× 143  planegeometry× 141 
gm.generalmathematics× 141 
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…

spectralgraphtheory× 140
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× 140 
graphcolorings× 139  intersectiontheory× 137  geometricmeasuretheory× 136 
books× 136
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…
