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There is Logseq ( https://logseq.com/ ) although it is more oriented to recreate Roam.

Regarding your second to last point, have a look at https://en.wikipedia.org/wiki/Classical_limit

That thesis discusses bispectral invariants on the group of rigid motions. I worked on a recent monograph on the same subject, which could interest you : https://arxiv.org/pdf/1704…

One has to be careful there. Yes, according to that data, in Italy 67% of homicides are by firearm while 11.9% of people have a firearm. Since the numbers for the US are 60% and 89…