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I have the diagram of the folllowing form:

\begindc
\obj(1,1){$A$}
\obj(3,1){$B$}
\obj(3,3){$C$}
\mor(1,1)(3,1) {$f$ }[\atright,\solidarrow]
\mor(1,1)(3,3) {$g$ }
\mor(3,1)(3,3) {$h$ }[\atright,\solidarrow]
\enddc

I wonder if the "objects" A,B,C must be in normal math font only, i.e. we can't replace such A with \mathsf{A} or \mathfrak{A} or \mathbf{A}. If this is really a restriction, is there any other package that allows special math fonts as "objects"?

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Welcome to TeX.SE. It is always best to compose a fully compilable MWE that illustrates the problem including the \documentclass and the appropriate packages so that those trying to help don't have to recreate it. As well, I took the liberty to format your post a little. See this link for more details on available formatting. –  tohecz Jun 24 '12 at 15:25
1  
You can use \obj(1,1)[A]{$\mathsf{A}$}, but I strongly advise you to use a more modern and powerful package such as tikz-cd or xy. –  egreg Jun 24 '12 at 15:38
    
Thank you very much for both comments. –  Pachara Jun 24 '12 at 15:47
    
@egreg It seems that your comment answers the question, or at least comes close to doing so. Please consider adding it as an answer. –  Andrew Uzzell Oct 12 '12 at 8:50

2 Answers 2

You can use

\obj(1,1)[A]{$\mathsf{A}$}

so that the optional argument sets the node name. However, there are more modern and powerful packages than dcpic for any sort of commutative diagram. I've used XY-pic (\usepackage[all,cmtip]{xypic}), but the more recent tikz-cd seems very promising and easy to use.

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As proposed by egreg, a more modern package would much easier for such things. The currently best package to learn should be tikz-cd (my recommendation). Here is your diagram using this.

% arara: pdflatex

\documentclass{article}
\usepackage{tikz-cd}
\usepackage{amsfonts}

\begin{document}
\begin{tikzcd}
                                                                       & C \\
    A\mathsf{A}\mathfrak{A}\mathbf{A} \arrow{r}[swap]{f} \arrow{ur}{g} & B \arrow{u}[swap]{h}   
\end{tikzcd}
\end{document}

enter image description here

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