\usemodule[article-basic]

\starttext

\startboxanchoring[+]
\connectboxanchors[top]    [top]    [distance=1ex] {c1}{c2}
\connectboxanchors[bottom] [bottom] [distance=1ex] {d1}{d2}
\startformula
    \mathboxanchored[nucleus]{c1}{e}_{\alpha}
    \mathboxanchored[nucleus]{c2}{e}^{\mu}
    \mathboxanchored[nucleus]{d1}{todo}
    \mathboxanchored[nucleus]{d2}{e}_{\dot{\beta}} = \frac{1}{\sqrt{2}}
    \sigma_{\alpha,\dot{\beta}}^{\mu}
\stopformula
\stopboxanchoring

\startboxanchoring[+]
\connectboxanchors[top]    [top]    [distance=0.5ex,arrow=no] {c1}{c2}
\connectboxanchors[bottom] [bottom] [distance=0.5ex,arrow=no] {c2}{c3}
\startformula
    \mathboxanchored[nucleus]{c1}{e}_{\alpha}
    \mathboxanchored[nucleus]{c2}{e}^{\mu}
    \mathboxanchored[nucleus]{c3}{e}_{\dot{\beta}} = \frac{1}{\sqrt{2}}
    \sigma_{\alpha,\dot{\beta}}^{\mu}
\stopformula
\stopboxanchoring

\startboxanchoring[+]
\connectboxanchors[top]    [top]    [text={\smallinfofont upper limits}]{b1}{b2}
\connectboxanchors[bottom] [bottom] [text={\smallinfofont lower limits}]{a1}{a2}
\startformula
\int_{\mathboxanchored{a1}{0}}^{\mathboxanchored{b1}{1}} \frac{1}{1+x^2} \dd x
=
\int_{\mathboxanchored{a2}{0}}^{\pi\mathboxanchored{b2}{/}4} \frac{1}{1+\tan^2 t}(1+\tan^2 t)\dd t
\stopformula
\stopboxanchoring

\stoptext