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A document is revealed in the Vatican, a small city that once ruled Europe. It is the trial record of Galileo Galilei, who argued for the heliocentric theory at a time when geocentrism was the established theory. The story begins here. 'Infinity', which was a problem that could not be solved and was taboo to even mention for a long time. Those who challenged this infinity were criticized and sometimes had to risk their lives. Are there many natural numbers? Are there many square numbers? This question by Galileo Galilei has put countless mathematicians and philosophers in trouble since ancient Greece. It tells the history of mathematics that studied infinity, which was thought to be the realm of God, and introduces people who approached the concept of infinity. #Galileo Galilei #Perspective #Numbers #The Path of Middelharnis