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42 Despite all this, there's probably enough decipherable material |
42 Despite all this, there's probably enough decipherable material |
43 here to interest the motivated reader. |
43 here to interest the motivated reader. |
44 On the other hand, if you are only going to read this paper once, |
44 On the other hand, if you are only going to read this paper once, |
45 {\bf then don't read this version,} as a more complete version will be available in a couple of months. |
45 {\bf then don't read this version,} as a more complete version will be available in a couple of months. |
46 |
46 |
|
47 \nn{maybe to do: add appendix on various versions of acyclic models} |
47 %\tableofcontents |
48 %\tableofcontents |
48 |
49 |
49 |
50 |
50 |
51 |
51 \input{text/intro} |
52 \input{text/intro} |