All file names should begin with the date and (preferably) your name, in the form
MMDDname (2008, spring 2009) or YYYYMMDDname (summer 2009, 2010).This is tremendously helpful in keeping track of all the parts of the project.
Similarly, all labels should have the date (see below). That will prevent duplicate labels.
You may include the whole header in your file instead, if you wish, but it's a little less convenient when I prepare the combined notes.
This won't provide automatic chapter numbering but we can manage without that.
To continue an existing section from the previous day, use the \section*{TITLE} command.
I've arranged the header so sections get letters (as in the outline) instead of numbers.
Don't use the environments "defna", "exama", etc. They're just part of my formatting.
The MMDD NAME part should be: MM = month number (e.g., 09); DD = date; NAME = some identifying code or word for that particular declaration. (See YYYY note.)