"Just because is not axiomatically true (for all P) does not mean that is true (for some P); this would lead to the contradiction . In fact, the deduction is not valid in second-order intuitionistic logic."
"Just because is not axiomatically true (for all P) does not mean that is true (for some P); this would lead to the contradiction . In fact, the deduction is not valid in second-order intuitionistic logic."