Theorem biimp3ar

Infer implication from a logical equivalence. Similar to biimpar. (Contributed by NM, 2-Jan-2009.)

Hypothesis
biimp3a.1
\( \vdash \varphi \wedge \psi \rightarrow (\chi \leftrightarrow \theta) \)
Conclusion
\( \vdash \varphi \wedge \psi \wedge \theta \rightarrow \chi \)
Proof
biimp3a.1
exbiri _
3imp _