[texhax] Heading question

[Reinhard Kotucha]

D. R. Evans writes:
 > If I make the \ifx test so that it reads:
 >   \ifx a a S \else D

You obviously compare the letter "a" with a space token.

Try

   \ifx a a \message{S} \else \message{D} \fi\end

and
   
   \ifx aa \message{S} \else \message{D} \fi\end

Regards,
  Reinhard

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