information:classification, information:filtering, information:highlighting, structural:expansion
Time

While ancient Greek philosophers believed that the universe had an infinite past with no beginning, early medieval philosophers and theologians developed the concept of the universe having a finite past with a beginning. This view was inspired by the creationism shared by Judaism, Christianity and Islam. The Christian philosopher John Philoponus presented a detailed argument against the ancient Greek notion of an infinite past. Muslim and Arab Jewish philosophers like Al-Kindi, Saadia Gaon, and Al-Ghazali developed further arguments, with most falling into two broad categories: assertions of the "impossibility of the existence of an actual infinite" and of the "impossibility of completing an actual infinite by successive addition".