According to James Warren, the distinction between the pre-Socratic philosophers and philosophers of the classical era is demarcated not so much by Socrates, but by geography and what texts survived.
Manut James Warren, pabinayan pantaraning filsuf pra-Socrates miwah filsuf era klasik nénten banget kawatesin olih Socrates, nanging olih geografi miwah teks napi sané nyeneng.