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.
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motives× 192 
computationalgeometry× 191
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…

convexoptimization× 190
Optimization with convex constraints and convex objectives; notions related to convex optimization such as subgradients, normal cones, separating hyperplanes

hodgetheory× 189 
characteristicp× 186  algebraicsurfaces× 185 
teaching× 185
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…

stablehomotopy× 184 
hilbertspaces× 184
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.

manifolds× 183  birationalgeometry× 182  euclideangeometry× 178 
riemannzetafunction× 176
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…

randomwalk× 173  monoidalcategories× 172 
textbookrecommendation× 171
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…

mathphilosophy× 168  eigenvalues× 166  groupactions× 164 
differentialoperators× 162
Elliptic, parabolic and hyperbolic operators. Laplace, LaplaceBeltrami, Schrödinger, Dirac. Exterior derivative and Lie derivative operators.

calculusofvariations× 162  semigroups× 160 
lfunctions× 157
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…

prooftheory× 154
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.

spectralgraphtheory× 154
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…

computeralgebra× 153
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…

langlandsconjectures× 152
Higher reciprocity laws

homology× 150 
graphcolorings× 150  classfieldtheory× 149 
universalalgebra× 149
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…

planegeometry× 148 
geometricmeasuretheory× 147
Questions about geometric properties of sets using measure theoretic techniques; rectifiability of sets and measures, currents, Plateau problem, isoperimetric inequality and related topics.

zetafunctions× 147  gm.generalmathematics× 146  intersectiontheory× 145 