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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

  • 1
    As @egreg had mentioned on deleted answer, use \ar@{-}. – Sigur Jun 4 '18 at 11:07
  • Sorry i can only use it to draw a straight l. – gcfsjfcus Jun 4 '18 at 11:16
  • As below, to curve, use @/^/ or @/_/ also. – Sigur Jun 4 '18 at 11:27
  • ...it doesn't work. – gcfsjfcus Jun 4 '18 at 11:42
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\documentclass{article}
\usepackage{amsmath}
\usepackage[all]{xy}

\begin{document}

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

\end{document}
  • 2
    If I'm not wrong, @{} will make an invisible arrow, no draw pattern. – Sigur Jun 4 '18 at 13:16

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