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Both. There was a man named Pythagoras and his followers were called the Pythagoreans. Yes, there was someone called Pythagoras, and those loyal to him were Pythagoreans, though Pythagoreans sounds more like a tribe of natives than a bunch of people who followed a man.
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There are 13 different books in "Euclid's Elements". There is not a specific name for the 13th book but it is about Pythagoreans.
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