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Only one of the following is valid in intuitionistic logic. Which one is it? (On...

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Only one of the following is valid in intuitionistic logic. Which one is it? (One strategy: start trying to build proofs of all of these, and see which one you can succeed on!)

$\neg \neg p / p$ \neg \neg p / p

$/ (p \rightarrow q) \rightarrow q$ / (p \rightarrow q) \rightarrow q

$p / \neg \neg p$ p / \neg \neg p

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