[pdftex] vertical line disappear

[Pétiard François]

Sorry, I don't understand the problem ; see the attached picture. Maybe 
it's a problem from your PDF reader ?

François

Le 20/05/2024 à 04:12, Aleks Kleyn a écrit :
> During last half year sometimes vertical line disappears from my pdf file.
> when it disappeared from frame, I do not care. But when I draw diagram, it
> is very important to show all arrows. In following example middle arow
> disappeared
>
> \documentclass{amsart}
> \usepackage[cmtip,all]{xy}
> \usepackage{framed}
>
> \begin{document}
> \[
> \xymatrix
> {
> V_1\ar[r]^{f_1}&V_2\ar[r]^{f_2}&...\ar[r]^{f_{n-1}}&V_n\\
> D_1\ar[r]^{f_1}\ar[u]|-{*}&D_2\ar[r]^{g_2}\ar[u]|-{*}&...\ar[r]^{g_{n-1}}&D_
> n\ar[u]|-{*}
> }
> \]
>
> \fbox{
> (10.1.10)\ \ \ $f\circ(av)=(g\circ a)(f\circ v)$
> }
> \fbox{
> (10.1.6)\ \ \ $g\circ(a+b)=g\circ a+g\circ b$
> }
> \end{document}
>
> Here also vertical line before second frame disappears.
>
> Thank you
> Aleks Kleyn
>
>
>
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