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Onedrive started giving us trouble recently. Files got moved from subfolders to the root of the library. Some searching and ignoring Microsoft own answers which basically was to reinstall or repair one user in a support thread gave me the information needed to fix this.
Apparently Onedrive doesn't like numbers in the beginning of folder names and it appears the risk of onedrive acting up is higher if there are a lot of subfolders. Some folders only got less than 10 subfolders but the troublemakers had over a hundred.
One solution is to delete the folder recreate and move the files back in there but there is no guarantee they wont throw back files to root. So I experimented and added a letter in front of the numbers and voila the problem fixed itself. The files in root even moved back to their correct folders.
My kid's algebra homework contains a symbol like an anti-clockwise arrow, sort of the opposite of ↻ (if it'll display).
It's mixed in with "rational exponents" and my wife and I have never seen them. We have been unable to figure out what it means and the kid doesn't seem to know.
I am not of the younger folks but I seem to remember that one might represent a 3/2D rotation with a vector adorned with such an arrow.
In which the vector axis is the rotation axis and the length / norm is the angle of rotation...