Deg tjerrumt tamensayt, Platon (429-347 uqbel Talalit n Ɛisa) yessemgared gar yisem d umyag. Aristot (384-322 uqbel Talalit n Ɛisa) yessemgared gar usekkil d umqim, d tunṭiqt,d tesɣunin, d yisem d umyag. Isṭuysiyen (300 uqbel Talalit n Ɛisa) kemmlen anadi n Platon d