Theorem biimp3a

Infer implication from a logical equivalence. Similar to biimpa. (Contributed by NM, 4-Sep-2005.)

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