All language is incomplete, so intuitionistic logic treats it as partial construct. "It's not NOT snowing" is no reason to say it's snowing.
Of course, we can safely ADD a rule saying that we suppose X when we know not not X. That's classical logic. It's convenient.
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Classical logic seems to say "were talking about real things; they're true or false". Intuitionism seems to say "it's linguistic construct".
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Yet, the distinction made here is very subtle. Intuitionism has no way to say "this thing here is neither true nor false". It's always open.
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