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\centerline{\bf Changes to the lecture notes --- 1}
\bigskip
\bigskip
A few items in the document(s) {\tt dgnotes2006aa.$*$} have been
corrected or updated in the more recent version 
{\tt dgnotes2006b.$*$}.  Here is a listing of the nontrivial
changes so that it is not necessary to print out an entire copy 
of the first 51 pages of the notes (minor misprints and stylistic
modifications have not been included in order to focus on the
main points).
\medskip
{\sl pages 34--35. }
There were some sign errors in the discussion of the local
canonical form for a curve, and these have been corrected.
The pages in the old version should be replaced with pages 
34--35 in the more recent version.
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{\sl page 37. }
References for the uses of differential forms in O'Neill have
been inserted.
\medskip
{\sl page 46. }
The first web link on the page has been changed to a later
version of the same material.
\bye

