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Inverse View
It is not the case that If 'not all beliefs are true' is true, then Protagoras' doctrine that all beliefs are true is false.
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Reasons For
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Reason for
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1.
Protagoras may mean 'true-for-the-believer,' not objectively true, making the claim immune to standard logical refutation.
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2.
The statement 'not all beliefs are true' doesn't necessarily negate Protagoras; it could mean 'not all are true-for-everyone' instead.
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3.
Meta-level claims about belief-systems differ in logical type from first-order beliefs, so standard contradiction rules may not apply.
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Reasons Against
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Reason against
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1.
Protagoras claims 'all beliefs are true'; this is itself a belief about beliefs that can be evaluated for truth.
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2.
If any belief can be false, then the universal claim 'all beliefs are true' is demonstrably false by counterexample.
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3.
Logic requires that contradictory propositions cannot both be true; thus one of these must be false.
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