On 18-8-2012 21:04, Andreas Mang wrote:
\startsubformulas[eq:ax=b]
\placeformula
\startformula \startalign
\NC a_1 x + b_1 y \NC = c_1 \NR[+][a]
\NC a_2 x + b_2 y \NC = c_2 \NR[+][b]
\stopalign \stopformula
\stoptext
You can put this in cont-new.mkiv (after \unprotect):
\def\strc_formulas_handle_sub_numbering
{\let\strc_formulas_handle_sub_numbering\relax % else error
\doiftextelse\currentsubformulasuffix
{\strc_counters_setown_sub\v!formula\plustwo\currentsubformulasuffix}
{\strc_counters_increment_sub\v!formula\plustwo}%
\placecurrentformulanumber}
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