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philosophy

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The Greek philosopher Plato
Plato, marble portrait bust copied from an original of the 4th century bce;...
© DeAgostini/SuperStock
Aristotle
Aristotle, marble portrait bust, Roman copy (2nd century bce)...
© A. Dagli Orti—De Agostini/Getty Images
Hilary Putnam
Wide-ranging American philosopher Hilary Putnam.
Photo courtesy of Harvard University
David Lewis
American philosopher of possible worlds David Lewis.
Courtesy of Princeton University, Princeton, New Jersey
John Chapman: Immanuel Kant
German philosopher Immanuel Kant surrounded by Ouroboros, an emblematic serpent of ancient...
© Photos.com/Getty Images
Karl Popper
Karl Popper, 1991.
Graziano Arici/age fotostock