Theorem
pm5.12
Theorem *5.12 of [WhiteheadRussell] p. 123. (Contributed by NM, 3-Jan-2005.)
Conclusion
\( \vdash (\varphi \rightarrow \psi) \vee (\varphi \rightarrow \neg \psi) \)
Proof
pm2.51
orri
_
This is the content in the right pane.