Remember the old, hackneyed paradox?
"This sentence is false."
Is it true? Let's suppose it is. So the statement that "the sentence is false" is a true statement. Consequently, the sentence is false actually, not true as first supposed. So the option left is for the sentence to be false. So, its opposite must be true and the sentence is actually true. And the cycle restarts.
The Socratic paradox is an example. "As for me, all I know is that I know nothing..."
The obvious question: how he knows that he knows nothing, if he knows nothing?
Eu acho que existe uma discussão acerca desse paradoxo em algum autor da lógica moderna, de filosofia de linguagem. É o mesmo de "deus pode fazer uma pedra que não pode carregar".
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