Math & Science ⇒ Diagram and '≅' sign using xymatrix

[xetal]

Hello,

I would like to draw a vertical isomorphism sign (i.e. a vertical "\cong") using xymatrix. Can this be done?

To be more precise, the command "\ar@{=}[d]" draws a vertical equal sign, I would like to replace "=" with "≅".

Cheers

[localghost]

[...] To be more precise, the command "\ar@{=}[d]" draws a vertical equal sign, I would like to replace "=" with "≅". [...]

It would be most precise if you provide a complete and compilable example of what you want to do.


Best regards
Thorsten

[frabjous]

I don't believe what you describe is possible using the xymatrix command from xypic alone, though it's certainly possible to create a vertical \cong of a certain length in other ways, but what would be most suitable depends on what use you're putting this to.

For example, the code below, using commands from graphicx, produces a vertical \cong of twice its usual length. But it may be hard to put that in a matrix in the right spot... hard to say without knowing what you're trying to do.

Code: Select all

\documentclass{article}
\usepackage{graphicx}
\begin{document}
\rotatebox{90}{\scalebox{2}[1]{$\cong$}}
\end{document}

[daleif]

Since a stretched \cong looks stupid, it is much more common to simply write \ar[r]^[\cong}, then every body understands what you mean (a map from A to B which is also an isomorphy)