Theorem exlimivv

Inference form of Theorem 19.23 of [Margaris] p. 90, see 19.23. (Contributed by NM, 1-Aug-1995.)

Hypothesis
exlimivv.1
\( \vdash \varphi \rightarrow \psi \)
Conclusion
\( \vdash \exists x \, \exists y \, \varphi \rightarrow \psi \)
Proof
exlimivv.1
exlimiv _
exlimiv _