This is TeX, Version 3.14159 (Web2C 7.3.1) (format=tex 2002.3.29)  2 MAR 2004 12:25
**enu
(enu.tex [1] [2]
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! Missing { inserted.
<to be read again> 
                   }
\dun ->{{\dot }
                \atop {\cup }}
l.234 \vert A \dun
                   B \vert = \vert A \vert + \vert B \vert \quad,
? x
Output written on enu.dvi (3 pages, 10468 bytes).