Hi all,
I generate a test problem as in the next form
-D\Delta u_1 +\mu_{a_1}u_1=S_1(x,y),\qq \text{in} \q \Omega
\frac{\ptl u_1(x,y)}{\ptl y}=u_0 \q \text{on} \q \Gamma_1,\\
I assumed a smooth solution, say
u(x,y)=\exp(x^2+y^2)
I computed the rhs regarding this solution in the given equation,
S_1=-Dx4\exp(x^2+y^2)(1+x^2+y^2)+\mu_{a_1} \exp(x^2+y^2).
\frac{\ptl u_1(x,y)}{\ptl y}=2y \exp(x^2+y^2).
I computed also the fe solution u_h.
When I computed l2 and h1 error, I found that the error is not admissible.
Can any one help me to fix the problem?_______________________________________________
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