= Corner compatibility for collinear oblique derivative data
{title2=$\beta_1+\beta_2=\pi/2\ \Longrightarrow\ h_2(0)=-h_1(0)$}
For a solution with a continuous <gradient> at a quadrant corner, the prescribed derivative directions are $( -\sin\beta_1,\cos\beta_1)$ and $(\cos\beta_2,-\sin\beta_2)$. When $\beta_1+\beta_2=\pi/2$, these vectors are negatives of one another. Their corner data must therefore be opposite. Imposing $h_1(0)=h_2(0)$ as well forces both to vanish. Smooth decay of separate boundary functions alone does not ensure this local <compatibility condition for an overdetermined linear system>.
// Target: analysis.bigb
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