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Commutative diagram defining a dinatural transformation.

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\documentclass{article}
\usepackage{xy}
\xyoption{all}

\begin{document}
\[
\xymatrix{
  &S(c,c)\ar[r]^{\alpha_c}&T(c,c)\ar[dr]^{T(1,f)}&\\
  S(c',c)\ar[ur]^{S(f,1)}\ar[dr]_{S(1,f)}&&&T(c,c')\\
  &S(c',c')\ar[r]_{\alpha_{c'}}&T(c',c')\ar[ur]_{T(f,1)}&
}
\]
\end{document}

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• (del) (cur) 13:03, 28 January 2006 . . en:User:Smimram Smimram ( en:User_talk:Smimram Talk) . . 450x197 (4996 bytes) ( \xymatrix{ &S(c,c)\ar[r]^{ \alpha_c }&T(c,c)\ar[dr]^{ T(1,f) }&\\ S(c',c)\ar[ur]^{ S(f,1) }\ar[dr]_{ S(1,f) }&&&T(c,c')\\ &S(c',c')\ar[r]_{ \alpha_{ c' } }&T(c',c')\ar[ur]_{ T(f,1) }& })
• (del) (rev) 13:01, 28 January 2006 . . en:User:Smimram Smimram ( en:User_talk:Smimram Talk) . . 450x1154 (8240 bytes) (\documentclass{ article } \usepackage{ xy } \xyoption{ all } \begin{ document } \[ \xymatrix{ &S(c,c)\ar[r]^{ \alpha_c }&T(c,c)\ar[dr]^{ T(1,f) }&\\ S(c',c)\ar[ur]^{ S(f,1) }\ar[dr]_{ S(1,f) }&&&T(c,c')\\ &S(c',c')\ar[r]_{ \alpha_{ c' } }&T(c',c')\ar[ur]_{ T(f,1) }& } \)