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%%                                                          %
%%  Definition av källtermen f(x,y) i ekvationen            %
%%                                                          %
%%      -div(a(x,y)*grad(u(x,y))) + c(x,y)*u(x,y) = f(x,y)  %
%%                                                          %
%%  Variabler:  delomradesnummer   heltal                   %
%%              x, y               reella tal               %
%%              source             reellt tal               % 
%%                                                          %
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function source = f_2D(x,y,delomradesnummer)

% Funktionen  f(x,y)
%
% Exempel:  source = 1;

source = 1;
