I posted a similar question a few days ago without success/response but since I have not found a solution anywhere I would like to ask this again: how can I get properly enumerated equations using `\mathcases'? this example does not work:

\starttext
bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla
\placeformula
\startformula
   E(f) = \frac {K_1(f)} {f}
\stopformula
\placeformula
\startformula
   K_1 \rightarrow
   \startmathcases
      \NC f  \NC for $f \ll PS$ (flow limited transport)      \NR
      \NC PS \NC for $f \gg PS$ (diffusion limited transport) \NR[+]
   \stopmathcases
\stopformula
bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla
\stoptext

since (as I now have "discovered" myself) the `\NR[+]' is here intended for subcases enumeration (which are, thus not aligned with the right margin0, rather than (like with \mathalign) for whole equation numbering. but omitting the `[+]' does not help either since \placeformula simply does not put an equation number at all.

so, simple question: how to get a properly numbered equation using \mathcases?

thx,joerg
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