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IN_THE_LIMIT

                                              September 20, 2006

In ideal fluid theory,
a "doublet" is the flow
pattern around a source
and a sink that are
right next to each
other.

You know the the lines of
force around a bar magnet?

Make the magnet shorter,
until the north and south
poles are right next to           DOUBLET
each other: that's a
doublet.

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