使用包 xy[barr,pdf] 的图表中的多余 '

Question

我在节点 up0 (U'^0) 中得到了一个多余的 '，如下所示

\documentclass{tac}

\usepackage{amsfonts}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage[barr,pdf]{xy}
\usepackage{bm}
\usepackage{enumitem}
\usepackage{ifthen}
\usepackage{mathtools}
\usepackage{xparse}
\usepackage{xstring}

% The TAC hyperref setup should be reloaded after other packages

\usepackage[colorlinks=true]{hyperref}
\hypersetup {
   allcolors=[rgb]{0.1,0.1,0.4},
   colorlinks,
   pdfinfo={
      Author={Shmuel (Seymour J.) Metz},
      Keywords={fibre bundles;manifolds},
      Subject={Topology},
      Title={A Proposed Unification of Manifolds and Fibre Bundles}
   }
}

  % Select font for function and sequences of function
  \newcommand \funcname [1] {\mathit{#1}}

\begin{document}

\begin{figure} [hbt]
\[ \bfig
\node x(0,500)[x]
\node u0l(-1000,0)[U_0]
\node up0(0,0)[U'_0]
\node u0r(1000,0)[U_0]
\node u1(-1000,-500)[U_1]
\node up1(-500,-500)[U'_1]
\node vp1(500,-500)[V'_1]'
\node v1(1000,-500)[V_1]
\node d1(-1000,-1000)[\vdots]
\node d2(-500,-1000)[\vdots]
\node d3(500,-1000)[\vdots]
\node d4(1000,-1000)[\vdots]
\node um(-1000,-1500)[U_m]
\node upm(-500,-1500)[U'_m]
\node vpn(500,-1500)[V'_n]
\node vn(1000,-1500)[V_n]
\arrow |l|/^{ (}->/[x`up0;i]
\arrow |b|/^{ (}->/[up0`u0l;i]
\arrow |a|[up0`up1;\funcname{f}_0]
\arrow |a|[up0`vp1;\funcname{f}'_0]
\arrow |b|/^{ (}->/[up0`u0r;i]
\arrow |r|[u0l`u1;\funcname{f}_0]
\arrow |l|[u0r`v1;\funcname{f}'_0]
\arrow |r|[u1`d1;\funcname{f}_1]
\arrow |t|/^{ (}->/[up1`u1;i]
\arrow |l|[up1`d2;\funcname{f}_1]
\arrow |t|/^{ (}->/[vp1`v1;i]
\arrow |r|[vp1`d3;\funcname{f}'_1]
\arrow |l|[v1`d4;\funcname{f}'_1]
\arrow |r|[d1`um;\funcname{f}_{m-1}]
\arrow |r|/^{ (}->/[d2`d1;i]
\arrow |l|[d2`upm;\funcname{f}_{m-1}]
\arrow |r|/^{ (}->/[d3`d4;i]
\arrow |r|[d3`vpn;\funcname{f}'_{n-1}]
\arrow |l|[d4`vn;\funcname{f}'_{n-1}]
\arrow |r|/^{ (}->/[upm`um;i]
\arrow |a|//[upm`vpn;\sim]
\arrow |b|/ >.>>/[upm`vpn;\funcname{f}'']
\arrow |t|/^{ (}->/[vpn`vn;i]
\efig \]
\caption{Local nearly commutative diagram}
\label{fig:NCDl}
\end{figure}

\end{document}

Answer 1

此行后面有一个多余的撇号：

   \node vp1(500,-500)[V'_1]' %<---- here