One member of this school of thought developed a t
One member of this school of thought developed a three stage criterion for it, which he illustrated by using the example of a rope in a dark room. Legendarily, the founder of one branch of this non-Confucian school left his friend to die while he was trapped in a hole. Circularity and regress are among this school’s “five modes” named for Agrippa, and it included Carneades. Pyrrhonism, a movement within this school of thought, included an author who wrote Against the Mathematicians, Sextus Empiricus. For 10 points name this school that questions the certainty of much of knowledge.