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e proof nor is it in an assumption of an open (active subproof), is it permissible to derive (x)Lxa xLxa from Laa Laa using a single instance of I I ?...

If a

a

 is not found as a premise in the proof nor is it in an assumption of an open (active subproof), is it permissible to derive (∀x)Lxa

∀xLxa

 from Laa

Laa

 using a single instance of ∀I

∀I

?

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