 -->Academy, Plato’s--> |  Anaxagoras |  Arcesilaus |  -->cynics, in ancient Greek philosophy--> |  doxography of ancient philosophy |  Empedocles |  -->Megaric School--> |  Protagoras |  Pyrrho |  Sextus Empiricus |  skepticism: ancient |  Xenophanes |  Zeno of Elea 