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Could you tell me how to remove the arrows of the curves using xy-pic? I didn't find the solution in xy-guide. Thanks advance for your help. enter image description here enter image description here

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    As @egreg had mentioned on deleted answer, use \ar@{-}.
    – Sigur
    Commented Jun 4, 2018 at 11:07
  • Sorry i can only use it to draw a straight l.
    – Ryze
    Commented Jun 4, 2018 at 11:16
  • As below, to curve, use @/^/ or @/_/ also.
    – Sigur
    Commented Jun 4, 2018 at 11:27
  • ...it doesn't work.
    – Ryze
    Commented Jun 4, 2018 at 11:42

1 Answer 1

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\documentclass{article}
\usepackage{amsmath}
\usepackage[all]{xy}

\begin{document}

\[
\xymatrix{
1\ {\circ} \ar@{}@/^/[r] \ar@{}@/_/[r]
& {\circ}\ 1
}
\]

\end{document}
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    If I'm not wrong, @{} will make an invisible arrow, no draw pattern.
    – Sigur
    Commented Jun 4, 2018 at 13:16

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