Theorem
19.25
Theorem 19.25 of [Margaris] p. 90. (Contributed by NM, 12-Mar-1993.)
Conclusion
\( \vdash \forall y \, \exists x \, (\varphi \rightarrow \psi) \rightarrow \exists y \, \forall x \, \varphi \rightarrow \exists y \, \exists x \, \psi \)
Proof
19.35
biimpi
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aleximi
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