I think this is overly narrow: Anaxagoras considered the problem of turning a circle into a square of the same area, and these mathematicians shed new light on

I think this is overly narrow: Anaxagoras considered the problem of turning a circle into a square of the same area, and these mathematicians shed new light on that problem. He was probably thinking of compass and straightedge because it was the only language he had for attacking the problem, but it's not he published a paper with the precise definition of the terms and the theorem he tried to prove. From what I can tell from a cursory search, there is no surviving fragment concerning squares and circles from Anaxagoras himself, and the mention on Wikipedia goes back to a quote from Plutarch: > There is no place that can take away the happiness of a man, nor yet his virtue or wisdom. Anaxagoras, indeed, wrote on the squaring of the circle while in prison.