Hi Pau, You should not use \leqaligno, but rather setup the location of the formulas' numbers to the left and then use \eqalign: the following works fine: %%------------- \setupformulas[location=left] \define[1]\eqref{(\in[#1])} % this definition is optional… \starttext \placeformula[nohair] \startformula \eqalign{ - M^{}_{\bullet}a^{2}_{\bullet} = & M^{}_{2} = - \frac{J^{2}_{1}}{M^{}_{0}} \,, \cr - M^{}_{\bullet}a^{3}_{\bullet} = & J^{}_{3} = \frac{M^{}_{2}J^{}_{1}}{M^{}_{0}}\,. \cr } \stopformula As one may see from equation (\in[nohair]), we have\dots It is more handy to use \type{\eqref}: as one sees in equation \eqref{nohair}, we have\dots \stoptext %%------------- Consider also using the ConTeXt math alignment commands for which Aditya has written a very nice My Way: http://dl.contextgarden.net/myway/mathalign.pdf See also: http://dl.contextgarden.net/myway/context-latex-math.pdf Best regards: OK On 4 sept. 2010, at 23:06, Pau wrote:

Hello,

I am a bit lost. I am using this format for an equation:

----------------------------------------------------------------- \placeformula[nohair] \startformula \leqalignno{ - M^{}_{\bullet}a^{2}_{\bullet} = & M^{}_{2} = - \frac{J^{2}_{1}}{M^{}_{0}} \,, \cr - M^{}_{\bullet}a^{3}_{\bullet} = & J^{}_{3} = \frac{M^{}_{2}J^{}_{1}}{M^{}_{0}}\,. \cr } \stopformula -----------------------------------------------------------------

but then,using \in[nohair] to link to the equation in the text of the document does not work.

I get a [??]

I think this is related to leqalignno, because \in[] works fine without it.

What should I do in this case?

thanks,

Pau