Columbia subject headings:
Anaximander.
Anaximenes, of Miletus.
Heraclitus, of Ephesus.
Parmenides.
Philosophy, Ancient.
Pre-Socratic philosophers.
Thales, approximately 634 B.C.-approximately 546 B.C.
Xenophanes, approximately 570 B.C.-approximately 478 B.C.
Harvard subject headings:
Anaximander
Anaximenes, of Miletus
Heraclitus, of Ephesus.
Parmenides.
Philosophy, Ancient.
Pre-Socratic philosophers.
Thales, approximately 634 B.C.-approximately 546 B.C.
Xenophanes, approximately 570 B.C.-approximately 478 B.C.
Princeton subject headings:
Anaximander.
Anaximenes, of Miletus
Heraclitus, of Ephesus
Parmenides.
Philosophy, Ancient.
Pre-Socratic philosophers.
Thales, approximately 634 B.C.-approximately 546 B.C.
Xenophanes, approximately 570 B.C.-approximately 478 B.C.