[texhax] controlling expansion

Neal H. Walfield neal at walfield.org
Thu Feb 28 15:51:02 CET 2013

I spent some time reading and found a good solution for determining
whether an argument is empty in David Solomon's Advanced TeXbook:

  \ifx\empty#1\empty empty \else not empty\fi

Nice trick!  TeX requires a lot of lateral thinking.


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