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%%                                                                %
%%  Definition av diffusions-koefficienten a(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                     %
%%              diffusion          reellt tal                     %
%%                                                                %
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function diffusion = a_2D(x,y,delomradesnummer)

% Funktionen  a(x,y)
%
% Exempel:  diffusion = 1;

diffusion = 1;
