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- NDSolve[
- {
- (-(D[u[x,y],x,x]+D[u[x,y],y,y])*(u[x,y]+[Lambda])) == 1,
- Integrate[(1+D[u[x,y],x]+D[u[x,y],y])^(1/2)[Element]RectangularPolygon[4],x,y]==1.5,
- DirichletCondition[u[x, y] == 0, True]
- },
- u,
- {x, y} [Element] RegularPolygon[4]
- ]
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