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Jul 14, 2023 at 16:53 vote accept RWien
Jul 14, 2023 at 13:05 history edited YCor CC BY-SA 4.0
removed capitals from title
Jul 12, 2023 at 20:24 answer added Robert Bryant timeline score: 8
Jul 12, 2023 at 0:26 comment added Robert Bryant I think that there must be something wrong with your equations. The first equation implies that $\psi_x\phi_y-\psi_y\phi_x=0$, but this iimplies that $\phi$ and $\psi$ cannot be independent functions of $(x,y)$. Surely you have a typo somewhere.
Jul 11, 2023 at 11:35 history asked RWien CC BY-SA 4.0