Inserting () in A on diagram #3 corrects the arrow tip at C.

But replacing C by a fraction, the problem comes back.



MWE

\documentclass[11pt,a5paper]{report}
\usepackage[all]{xy}
\SelectTips{cm}{11}

\begin{document}
$\xymatrix{%
  A \ar[r]  \ar `d/8pt[r] `[rr] [rr]
&amp; \displaystyle\frac{A}{B} \ar[r]
&amp; \frac{A}{B}
}$

$\xymatrix{%
  A \ar[r] \ar `d/8pt[r] `[rr]_{s} [rr]
&amp; \displaystyle\frac{A}{B} \ar[r]
&amp; C
}$

$\xymatrix{%
  (A) \ar[r] \ar `d/8pt[r] `[rr]_{s} [rr]
&amp; \displaystyle\frac{A}{B} \ar[r]
&amp; C
}$

$\xymatrix{%
  (A) \ar[r] \ar `d/8pt[r] `[rr]_{s} [rr]
&amp; \displaystyle\frac{A}{B} \ar[r]
&amp; \frac{A}{B}
}$
\end{document}




(original post)


I have no idea how to correct the arrow tip for s arrow. The strange is that I just copied the code for s from another diagram I have in the same file, which works perfectly, as you can see below:





How to move the s arrow down without increasing the radius for the circle? I mean, I'd like to have a bigger space between the arrow and B. I know that I could add a new line but I'd like to keep only one.
Why \displaystyle is lifting A? How to write correctly the middle fraction? I tried \dfrac but no success.


MWE

\documentclass[12pt,margin=0mm]{standalone}
\usepackage[all]{xy}

\begin{document}
$\xymatrix{%
  A \ar[r]  \ar `d/8pt[r] `[rr]_{s} [rr]
&amp;
  \displaystyle\frac{A}{B} \ar[r]
&amp;
  \frac{A}{B}
}$
\end{document}





Question: Can a PC have more than one Default Gateway?
Answer: Technically yes, practically no.

The key is in the term 'default', it's the default - I have a default sandwich I order from Subway (Meatball Marinara with cheese and jalapeños) which I vary from routinely, still my default though, I don't have two defaults.

So it's the same with network interfaces, you define the 'norm' and then specify whenever you want to break from that norm via 'static routes' (look at the 'route' command on your OS of choice).

Hope this helps, and didn't make you too hungry...