February 2023
Beginner
432 pages
12h 2m
English
Suppose
is a closed trajectory in
. Then the inner product
, where
is the vector field defining (2.27) and
is the outward normal to
. Consequently, the line integral around the closed orbit satisfies
. Therefore, by Green's theorem we have
where
is the region enclosed by
. Therefore, either
is identically zero in , or it changes ...
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