formla: listing and subnumbering

[Peter Schorsch <tralalas@freenet.de>]

Hi,

in my work I have a lot of formulas inkl. subformulas. Doing the examples at 
the wiki two questions came up:
 a) how to generate a table of formulas?
 b) what is the right/better way for subnumbering?

a) I tried the example for generating a table of formulas from the wiki
(http://wiki.contextgarden.net/Math/Display#List_of_Formulas) but instead of 
a list I get in the pdf a »no list method«. What do I missed here?

b) I found two descriped ways how to create formula (sub-)numbering:
     1) using \formulanumber and \subformulanumber (third example from 
http://wiki.contextgarden.net/Math/Display#The_Manual_Method). But context 
always reports here: ! Undefined control sequence.
<argument> ...^{\vfrac {1}{2}} &\subformulanumber 
                                                  {b}\cr a^2 + b^2 &= c^2 
&\...
      2) using the \NR[..] like it is described on 
http://wiki.contextgarden.net/Multiline_equations#Working_with_equation_numbering 
and http://dl.contextgarden.net/myway/mathalign.pdf. This way compiles 
through. 

But which way is the future context way? In which way can I combine 
subnumbering and including to list some (not all) subformulas?

Thanks for your help

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