Modal Logic is Intensional
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Theorem
Modal logic is intensional, in the sense that:
- the truth value of a WFF $\AA$ does not determine the truth value of $\map \nec \AA$.
Proof
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Sources
- 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): modal logic
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): modal logic