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[Marten Bauer <address@hidden>]

Hello Richarch,

> a | b
>  |____
>  |
> r | q
>
>  
I'm not familar with this notation, but could'nt you do it with a table 
in math mode?
I just tried the following way:
1. ALT-SHIFT-$ (for math mode)
2. M-t-N-t to create a table
3. ALT-Cursordown, ALT-Cursorright to make 2 Rows and 2 Columns
4. go to upper right cell M-t-b-l (create border left) enter for example 
0.1em
5. also in the upper left cell M-t-b-b (create bordr bottom) enter als 0.1em
6. go to lower right cell
7. M-t-b-l (create border left) 0.1em

Then you got a table looking like the above example.
As further improvmemnt you can switch to the sourcecode view and create
a macro from the code. You can try this macro if it fit your needs:

<assign|euklid|
<macro|a|b|r|q|
<tabular*|
<tformat|
<cwith|2|2|2|2|cell-lborder|0.1em>|
<cwith|1|1|2|2|cell-lborder|0.1em>|
<cwith|1|1|2|2|cell-bborder|0.05em>|
<table|<row|<cell|<arg|a>>|<cell|<arg|b>>>|<row|<cell|<arg|r>>|<cell|<arg|q>>>>>>>>

You can enter it with \euklid and then write the values for a,b,r,q

greeting
Marten