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: 
motives× 206  stablehomotopy× 205 
computationalgeometry× 203
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× 202 
hilbertspaces× 202
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.

hodgetheory× 202  birationalgeometry× 196  randomwalk× 196 
manifolds× 194 
riemannzetafunction× 193
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…

combinatorialgeometry× 192

characteristicp× 190 
teaching× 190
For questions related to teaching mathematics. For questions in Mathematics Education as a scientific discipline there is also the tag mathematicseducation. Note you may also ask your question on htt…

euclideangeometry× 189 
mathphilosophy× 183
Philosophical aspects of logic and set theory; truth status of mathematical axioms; Philosophy of Mathematics; philosophical aspects of mathematics in general; relation of mathematics to philosophy; e…

textbookrecommendation× 183
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× 182  groupactions× 180 
graphcolorings× 180
Vertex colouring, Edge Colouring, List Colouring, Fractional Chromatic Number and other variants of graph colouring problems are all on topic.

eigenvalues× 179 
calculusofvariations× 177 
differentialoperators× 175
Elliptic, parabolic and hyperbolic operators. Laplace, LaplaceBeltrami, Schrödinger, Dirac. Exterior derivative and Lie derivative operators.

lfunctions× 172
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× 172 
prooftheory× 171
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.

computeralgebra× 166
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…

geometricmeasuretheory× 164
Questions about geometric properties of sets using measure theoretic techniques; rectifiability of sets and measures, currents, Plateau problem, isoperimetric inequality and related topics.

spectralgraphtheory× 164
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…

planegeometry× 163 
langlandsconjectures× 163
Higher reciprocity laws

permutations× 162
Questions related to permutations, bijections from a finite (or sometimes infinite) set to itself.

classfieldtheory× 161 
kahlermanifolds× 159
Questions about Kähler manifolds and Kähler metrics.

intersectiontheory× 156 
nonlinearoptimization× 155
Nonlinear objectives, nonlinear constraints, nonconvex objective, nonconvex feasible region.

gm.generalmathematics× 155 