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He established ethical, moral, and social standards that formed the basis of a way of life known as Confucianism.
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He established a form of cooperative argumentative dialogue between individuals, based on asking and answering questions to stimulate critical thinking and to draw out ideas and underlying presuppositions called the Socratic method.
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Thrasymachus' insistence that justice is nothing but the advantage of the stronger seems to support the view that moral values are socially constructed and are nothing but the reflection of the interests of particular political communities.
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Plato is also considered the founder of Western political philosophy. His most famous contribution is the theory of Forms known by pure reason, in which Plato presents a solution to the problem of universals known as Platonism (also ambiguously called either Platonic realism or Platonic idealism).
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Aristotle studied and made significant contributions to "logic, metaphysics, mathematics, physics, biology, botany, ethics, politics, agriculture, medicine, dance, and theatre."
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Augustine is a fourth century philosopher whose groundbreaking philosophy infused Christian doctrine with Neoplatonism. He is famous for being an inimitable Catholic theologian and for his agnostic contributions to Western philosophy.