Hi, I was just browsing your solutions website in order to collect solutions for Penrose's RTR book and thought you might want to know that RoadToReality.Info expired on the 23rd of March and that the owner apparently hasn't renewed it - which means that the domain is probably pending deletion within the next few days unless the owner makes a surprise late payment before then. This would therefore be the right time to save these solutions, in case you want to keep them from disappearing from your collection.
Thanks for letting me know about this, but it seems to be working OK again now. Is it working for you?Vasco
Just in case, I have downloaded ALL of those solutions to my hard drive. Of course if the original site goes down, my solutions are not necessarily organized and I have only downloaded random files from the discussions.
All I can say is that I am in personal contact with the owner of the site and I know that he intends to keep the site going indefinitely. Obviously this is not a 100% guarantee.Vasco
Took me a year and a half, but I finally have a complete solution to Problem 13.7 involving normal subgroups of the Lie groups SO(3) and O(3). I also decided my problem solutions would likely be easier to access and endure much longer by uploading them to GitHub. So, a better location than my Dropbox site to grab them from is https://github.com/matrixbud?tab=repositories. My free Clifford Algebra package for Mathematica can also be downloaded from there. Vasco, if you get the time, you might want to change that link.