Theorem 19.35ri

Inference associated with 19.35. (Contributed by NM, 12-Mar-1993.)

Hypothesis
19.35ri.1
\( \vdash \forall x \, \varphi \rightarrow \exists x \, \psi \)
Conclusion
\( \vdash \exists x \, (\varphi \rightarrow \psi) \)
Proof
l0
19.35ri.1
\( \vdash \forall x \, \varphi \rightarrow \exists x \, \psi \)
19.35
\( \vdash \exists x \, (\varphi \rightarrow \psi) \leftrightarrow \forall x \, \varphi \rightarrow \exists x \, \psi \)
mpbir l0 _