Dear List,

I have an example, where the formula should be more left. Maybe something with \startalign?

setuppapersize[A4]

\setcounter[userpage][439]

\setupbodyfont[modern, 12.95pt]

\setuplayout[backspace=2.9cm,

             width=13.50cm]

\defineenumeration

  [theorem]

  [

    text=Theorem,

    title=yes,

    width=fit,

    distance=0.2em,

    alternative=serried,

  ]

\definetextbackground[GrayBackground][

  location=paragraph,

  background=color,

  backgroundcolor=lightgray,

  leftoffset=.5\bodyfontsize,

  rightoffset=.5\bodyfontsize,

  topoffset=.5\bodyfontsize,

  bottomoffset=.5\bodyfontsize,

  frame=off,]

\starttext

\blackrule[color=black, height=0.10ex, width=13.50cm]\dontleavehmode

\inrightmargin{\blackrule[color=black, height=0.10ex, width=1.11cm]\par {\bf 7.3.53}}

\usecolors[svg]

\setupinteraction

  [state=start,

   contrastcolor=cornflowerblue]

\reference[Abschnitt:1]{7.3.52}

{\bi Beweis (von Proposition \goto{7.3.53} [Abschnitt:1]). \tf Die Eigenschaften (i)-(iii) fol-\par

gen unmittelbar durch leichte Rechnung aus der Definition. \blank

(iv) \space \space Wir berechnen \m u × (\m v × \m w):\nospace

\startformula

\m u  ×(\m v × \m w )=\m u × \startmathmatrix[fences=parenthesis]

\NC \m v_2w_3 \NC - \NC \m v_3w_2 \NR

\NC \m v_3w_1 \NC - \NC \m v_3w_2\NR

\stopmathmatrix

\stopformula

Many thanks

Uschi