Theorem
pm3.33
Theorem *3.33 (Syll) of [WhiteheadRussell] p. 112. (Contributed by NM, 3-Jan-2005.)
Conclusion
\( \vdash (\varphi \rightarrow \psi) \wedge (\psi \rightarrow \chi) \rightarrow \varphi \rightarrow \chi \)
Proof
imim1
imp
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