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This text is used to teach calculus in my school. Last year, after--------snip---------
attempting to guide my students through Gauss' law, I looked up the
treatment of flux in the multivariable calculus book. It seemed to me the
presentation of flux lacked any intuitive feel for what flux is used
for. Instead, it was presented as an exercise in doing integrations over
projection surfaces. In addition, the artwork was inadequate. The
figures, which appear to come directly from the output of Mathematica
program, fail to convey their intended meaning.