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Martin Sleziak
Martin Sleziak
07:14
specific-question BTW the question Is $\delta(df \wedge df)=0$ an Euler-Lagrange equation? is also missing a top-level tag. (This is the question linked as an example in the recent post about the begingroup - endgroup problem.
14
Q: Is $\delta(df \wedge df)=0$ an Euler-Lagrange equation?

Asaf Shachar$\newcommand{\id}{\operatorname{Id}}$ $\newcommand{\TM}{\operatorname{TM}}$ $\newcommand{\Hom}{\operatorname{Hom}}$ $\newcommand{\M}{\mathcal{M}}$ $\newcommand{\N}{\mathcal{N}}$ $\newcommand{\tr}{\operatorname{tr}}$ $\newcommand{\TM}{\operatorname{T\M}}$ $\newcommand{\TN}{\operatorname{T\N}}$ $\n...

riemannian-geometry vector-bundles calculus-of-variations inverse-problems
I see that calculus of variations is listed in the tag-excerpt for ca.classical-analysis-and-odes.
 
2 hours later…
Martin Sleziak
Martin Sleziak
08:48
specific-question Possibly automorphism-groups would be a suitable addition to the tags for Objects with trivial automorphism group?
6
Q: Objects with trivial automorphism group

NadiaSuppose I am working with a category of objects such that each object $X$ in the category has as a trivial automorphism group. An example of such an object would be genus zero curves with $n$-punctures, i.e., $(\mathbb{P}_k^1, (s_i)_{i=1}^n \in k )$. Let $F(S)/{\sim}$ represent families of thes...

ag.algebraic-geometry ct.category-theory moduli-spaces
 
8 hours later…
François G. Dorais
François G. Dorais
16:19
@abatkai I recommend creating a tag for semigroups-of-operators for this usage. In general, using tags as modifiers is inappropriate, tags should be nouns.
 
3 hours later…
abatkai
abatkai
18:59
@FrançoisG.Dorais thanks. In my opinion it would be the best simply having one tag "semigroups" for all these usage.
 
4 hours later…
François G. Dorais
François G. Dorais
22:48
@abatkai One reason it was changed is that the semigroups tag was too often used as a modifier. Made up example, one shouldn't use [matrices] [semigroups] and one should use [matrix-semigroups] or [semigroup-of-matrices] instead. The reason is that the primary use of tags is to help search and modifiers aren't useful for that: if you were interested in "striped yellow balls", you would start your search with "balls", not with "striped" or "yellow".

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