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Re: Composite character subscripts


Nice try, but no cigar.  TeX's braces have the `unusual' side-effect
of turning their contents into a mathord!  Compare:
$$X{\relbar\joinrel\rightarrow}Y$$ with
$$X \relbar\joinrel\rightarrow Y$$.

Oh dear...  Really the culprit is the fact that there's no way to
bracket an argument in math mode without simultaneously turning it
into a mathord.