A vector field
, defined in an open set
of
, is lamellar if the condition
is satisfied in every point
Here,
is the curl
or rotor of
. The condition is equivalent with both of the following:
taken around any closed contractible curve
where the point
Note. In physics,
is in general replaced with
. If the
is interpreted as a force, then the potential
is equal to the work
made by the force when its point of application is displaced from
to infinity.
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