\ifx treats a control sequence differently if it is named using a \csname...\endcsname pair – tex.stackexchange.com

\ifx treats a control sequence differently if it is named using a \csname...\endcsname pair – tex.stackexchange.com

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Aren't the two expressions \a and \csname a\endcsname supposed to be equivalent? Yet the following plain TeX manuscript \ifx\a\relax yes\else no\fi\bye outputs no whereas the supposedly ...

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