Theorem
anim1ci
Introduce conjunct to both sides of an implication. (Contributed by Peter Mazsa, 24-Sep-2022.)
Hypothesis
anim1i.1
\( \vdash \varphi \rightarrow \psi \)
Conclusion
\( \vdash \varphi \wedge \chi \rightarrow \chi \wedge \psi \)
Proof
l0
anim1i.1
id
anim12ci
l0
_
This is the content in the right pane.