Today, I had to do an exercise that talked about conformal geometry and after spending a ridiculous amount time searching for it in General Relativity books I couldn't find it. In books like Ray D'Inverno, Schutz and Sean Carroll they state the theorems, but never prove them, so I am asking if you could recommend any book on conformal geometry and whatever math you think is going to be essential to understand really well General Relativity.
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