I'm changing a document prepared in Plain TeX and I'm trying to get a brace to cover multiple lines for example:
S is P { cannot both be true (L. of Contradiction)
S is not P { cannot both be false (L. of Excluded Middle)
I know how to do this in LaTeX but I am struggling to find a Plain TeX version. I have this so far which causes excessive whitespace and pushes the RHS almost off the page.
$ \vbox{ {\it S is P}\hfil\break
{\it S is not P} } \left\{ \vbox{cannot both be true (L. of Contradiction)\hfil \break
cannot both be false (L. of Excluded Middle).} \right. $
Does anyone have any suggestions? Thankyou.