[this](link)
is certainly not optimal for future visitors. Is there a categorical treatment of dynamical systems? 
Let $X$ be a set and $(T,\cdot)$ an abelian group. Is there a category of $T$-dynamical systems on $X$ which yields useful information about $X$ and $T$?
More precisely, is there a category whose objects are dynamical systems, i.e., $\phi:X \times T \to X$ such that $\phi(x,t + s) = \phi(\phi(x,...

This question from March 2020 points out that many questions/answers link to papers at the http://front.math.ucdavis.edu/ frontend instead of at the arXiv itself, but that the frontend had been down a few weeks. There are c.600 affected questions and it looks like a large proportion of the links...

At this moment, it is unclear whether a project like this should be done. (After all, until we heard from people running the arXiv frontend, we still should count as a possibility that it will be running again at some point.)
Still, it might be useful to analyze a bit what would the scope of the ...
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