Re: [NTG-context] Math alignment

On 7 Jul 2015, at 20:17, Wolfgang Schuster wrote:

You can set the alignment for each column in a matrix with the align key.

FYI, the document amshelp.pdf says that AMS-LaTeX environments align, align*, and aligned, can have multiple alignments, and gives this example: \begin{align*} K &\approx G * H& i&= j+k& B &\subset C\\ H &\approx A_{0}*B_{0}& i’&= j’+k’& C &= D\cap E\\ G &\approx \coprod_{\alpha\in A} L_{\alpha}& i’’&=j’’+k’’& A &= D \cup E \end{align*} which is typeset so that 'K &\approx G * H’ is one equation aligned on the ‘&’ with the others below, followed by 'i&= j+k’ in the next column. So the ampersands have multiple functions here, it seems: alignment and separating columns. Translating into ConTeXt, one might have (pseudocode): \startformula \startalign \NC K \NA \approx G * H \NC i\NA= j+k \NC B \NA \subset C \NR \NC H \NA \approx A_{0}*B_{0} \NC i’\NA= j’+k’ \NC C \NA = D\cap E\NR \NC G \NA \approx \coprod_{\alpha\in A} L_{\alpha} \NC i’’\NA =j’’+k’’ \NC A \NA = D \cup E \NR \stopalign \stopformula where I have introduce a symbol \NA for alignment.