Does Protagoras refute himself?

Classical Quarterly 45 (02):333- (1995)
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Abstract

Protagoras believes that all beliefs are true. Since Protagoras' belief that all beliefs are true is itself a belief, it follows from Protagoras' belief that all beliefs are true that Protagoras' belief is true. But what about the belief that Protagoras' belief is false? Doesn't it follow, by parallel reasoning and not at all trivially, that if all beliefs are true and there is a belief that Protagoras' belief is false, then Protagoras' belief is false?

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Did Plato Refute Protagoras?James Haden - 1984 - History of Philosophy Quarterly 1 (3):225 - 240.
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Sophie Grace Chappell
Open University (UK)

References found in this work

The Theaetetus of Plato.Miles Burnyeat - 1990 - Hackett Publishing Company.
Philosophical Reasoning.John Passmore - 1961 - Philosophy 38 (146):371-372.
Plato: Theaetetus.John McDowell - 1973 - Philosophy 49 (189):328-330.

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