6:21 AM
@MartinSleziak actually it sounds redundant with which already currently exists in 55 questions (in addition : 9 questions, and : 26 questions are tightly related).

@YCor Personally I do know enough about this topic to be able to judge whether or not the tag is going to be useful.
It is possible that the OP will ignore my suggestion - and without the tag-wiki and having only single question, the tag will be removed after 6 months by the SE software.
(originally posted in math stackexchange, but I deleted that post when I saw it had no responses.) Here is the story as I see it. Let $G$ be either an abelian td-group or an abelian locally compact group. Then the (spherical) Hecke algebra for $K=1$ is by definition automorphism group of $l^2(G... 1 hour later… 7:50 AM In my opinion, this is one of the challenges of creating a reasonable tag system on Stack Exchange site. If there are only large tags, searching is more difficult. (Still, they are important - they help categorization, they have more follower and improve visibility of questions.) Smaller tags are very useful when searching for some topic. But if there are too many very specific tag, often it we will run out of space when tagging questions - since there can only be five tags. 2 hours later… 9:23 AM @MartinSleziak (on adding ) all these tags look good, I'd remove none of them. Or maybe as a bit redundant to and a bit more inclined to classical analysis. 4 hours later… 1:10 PM A new tag was created by YCor, including a tag-excerpt. In mathematics, an Azumaya algebra is a generalization of central simple algebras to R-algebras where R need not be a field. Such a notion was introduced in a 1951 paper of Goro Azumaya, for the case where R is a commutative local ring. The notion was developed further in ring theory, and in algebraic geometry, where Alexander Grothendieck made it the basis for his geometric theory of the Brauer group in Bourbaki seminars from 1964–65. There are now several points of access to the basic definitions. == Over a ring == An Azumaya algebra over a commutative ring R is an R-algebra A that is free and... 5 Azumaya originally defined an Azumaya algebra (which he called a proper maximally central algebra) to be an algebra A which is a free module of finite rank over its centre Z such that the natural map $$A\otimes_Z A^{\mathrm{op}}\to \mathrm{End}_Z(A)$$ is an isomorphism. More modern definitions (e... 2 While studying vector bundle valued differential forms,$\Omega^{\bullet}(M, E)$, or$\Omega^{\bullet}(M, \mathrm{End}(E))$if that helps this discussion, I've come across some work in Azumaya algebras. Thinking of$\Omega$as an$R\$-module, taking values in a bundle, and reading about how Azuma...