equal
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23 |
23 |
24 [revision $\ge$ 276; $\ge$ 30 May 2010] |
24 [revision $\ge$ 276; $\ge$ 30 May 2010] |
25 |
25 |
26 \textbf{Draft version, read with caution.} |
26 \textbf{Draft version, read with caution.} |
27 |
27 |
28 \medskip |
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29 |
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30 \nn{need to remove or at least water down this warning for the arxiv version} |
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31 |
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32 \noindent |
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33 {\bf Warning:} This draft is draftier than you might expect. |
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34 More specifically, |
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35 \begin{itemize} |
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36 \item Some sections are missing. |
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37 \item Many sections are incomplete. |
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38 In most cases the incompleteness is noted, but occasionally it isn't. |
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39 \item Some sections were written nearly two years ago, and are now outdated. |
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40 \item There are not yet enough citations to similar work of other people. |
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41 \end{itemize} |
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42 Despite all this, there's probably enough decipherable material |
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43 here to interest the motivated reader. |
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44 On the other hand, if you are only going to read this paper once, |
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45 {\bf then don't read this version,} as a more complete version will be available in a couple of months. |
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46 |
28 |
47 \nn{maybe to do: add appendix on various versions of acyclic models} |
29 \nn{maybe to do: add appendix on various versions of acyclic models} |
48 |
30 |
49 \paragraph{To do list} |
31 \paragraph{To do list} |
50 \begin{itemize} |
32 \begin{itemize} |