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lang-mma
op==0+NeumannValue[ ? ]. What goes inside the NeumannValue function to specify the actual boundary conditions? From your answer, I see that in terms of the variables given in the documentation,c= {{-1,0},{0,0}},a=-y^2, and alpha=beta=gamma=f=0. But the connection betweencand the argument of the NeumannValue call that I need to implement is unclear, if such a connection exists. $\endgroup$-{{-1,0},{0,0}}.Grad[f]=={Derivative[1,0]f][x,y],0}. This resulty has to be multiplied by the unit normal of the boundary to get theNeumanValue. See my modified answer! $\endgroup$