This shortcut is very nice.

I figured out that it is either the same or almost the same as

<assign|minus-sep|<with|line-width|1.5ln|<line|<point|0par|0.5ex>|<point|1par|0.5ex>>>>

On 12.02.21 15:32, Ibrahima Fall wrote:
> Hi;
> Just type the "-" (minus sign or hyphen) four times.
> "----"
>
> best regards
>
> Le ven. 12 févr. 2021 à 14:02, Giovanni Piredda <address@hidden
> <mailto:address@hidden>> a écrit :
>
>     Waiting that someone else gives a better answer, you can use this
>     function
>
>     (lambda ()(stree->tree '(line (point "0par" "0par") (point "1par"
>     "0par"))))
>
>     which you can conveniently put in an extern macro and assign to a
>     "separator" macro:
>
>     <assign|separator|<extern|(lambda ()(stree-\<gtr\>tree '(line
>     (point "0par"
>     "0par") (point "1par" "0par"))))>>
>
>     G.
>
>
>     On 12.02.21 14:53, Frank wrote:
>     > Dear all,
>     >
>     > I wonder how to insert an horizontal separator. For example, when I
>     > prepare a set of problems, I want to put a separator so that the
>     > exercises in each group are closely related.
>     >
>     > Best,
>     > Frank
>