The Helmholtz class defines the Helmholtz problem
 |
(84) |
with natural boundary conditions
 |
(85) |
and constraints:
where  |
(86) |
,
,
have to be a scalar Data object in the general FunctionSpace,
and
must be a scalar Data object in the boundary FunctionSpace,
and
and
must be a scalar Data object in the solution FunctionSpace or must be mapped or interpolated into the particular FunctionSpace.
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