[texhax] Blank output with just \hrule

Ludwig Mises ludwigmises at gmail.com
Sun Jan 4 20:19:23 CET 2009

I know I've read about this in the TeXbook but I can't seem to find it
now.  I have the following:



This results in blank output, yet if I insert a word anywhere between
any of those hrules, suddenly all 4 hrules show up.  Will someone
point me to the explanation (if possible)?  I tried to put them in a
\vbox but that made no difference (why would it since we're already in
vertical mode right)?



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