Theorem imim2d

Deduction adding nested antecedents. Deduction associated with imim2 and imim2i. (Contributed by NM, 10-Jan-1993.)

Hypothesis
imim2d.1
\( \vdash \varphi \rightarrow \psi \rightarrow \chi \)
Conclusion
\( \vdash \varphi \rightarrow (\theta \rightarrow \psi) \rightarrow \theta \rightarrow \chi \)
Proof
imim2d.1
a1d _
a2d _