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15 Sep
2015
15 Sep
'15
1:23 p.m.
Hi, when you pass a undefined argument to \lfence (or \rfence and \mfence) you get the "unknown" alternative \setvalue{\??mathleft \s!unknown}{\setfalse\c_math_fenced_done\ifconditional\c_math_fenced_unknown\normalleft \nexttoken\fi} which doesn’t work here because \nexttoken is never set by \lfence but only by \left. Wolfgang
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Wolfgang Schuster