[Nek5000-users] solving a helmholtz problem

[nek5000-users at lists.mcs.anl.gov]

Dear Neks,

I want to solve the following Helmholtz problem:

(A- c* B) f = g 

with functions f and g equal zero at the boundary

c -- given positive real constant 
g -- given input field 
A -- mass matrix
B -- discrete Laplacian

How do I have to set up the .rea file to solve such a problem with nek.

Thanks, Joerg.