Thank you for your reply. When I typeset the example you sent me, that is
\definemathsimplealign[alignedcases]
[left={\startmathfenced[cases]},
right=\stopmathfenced,
align={1:right,2:left,3:left},
strut=yes]
\setupformula
[location=left]
\starttext
\samplefile{knuthmath}
\startplaceformula
\startformula
\startalignedcases
\NC u'(t) - \nabla \cdot (a(x)\nabla u) + Vu \NC = 0 \NC \mtext{bla bla bla} \NR
\NC u(x,0) \NC = u_0(x) \NC \mtext{bla bla} \NR
\NC u(t,\sigma) \NC = 0 \NC \mtext{bla bla bla bla} \NR
\stopalignedcases
\stopformula
\stopplaceformula
\samplefile{knuthmath}
\startplaceformula
\startformula
\startalign[location=packed,n=2,m=2,align={1:right,2:left},fences=cases]
\NC u'(t) - \nabla \cdot (a(x)\nabla u) + Vu \NC = 0 \NC \NC \mtext{bla bla bla} \NR
\NC u(x,0) \NC = u_0(x) \NC \NC \mtext{bla bla} \NR
\NC u(t,\sigma) \NC = 0 \NC \NC \mtext{bla bla bla bla} \NR
\stopalign
\stopformula
\stopplaceformula
\samplefile{knuthmath}
\stoptext
% end 240117-1-bis.tex
I get something different than the PDF you sent me: the formulas run into the text just above them, as you can see in the attached PDF. I am using ConTeXt LMTX version 2024.01.08 on MacOS 11.7.10. I don’t see what is wrong with my installation…
Best regards: Otared