Theorem
pm3.45
Theorem *3.45 (Fact) of [WhiteheadRussell] p. 113. (Contributed by NM, 3-Jan-2005.)
Conclusion
\( \vdash (\varphi \rightarrow \psi) \rightarrow \varphi \wedge \chi \rightarrow \psi \wedge \chi \)
Proof
id
anim1d
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