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Sep 18, 2019 at 19:09 comment added Jochen Glueck Theorem 8 on p. 176-177 of Protter/Weinberger seems to include the case of Neumann boundary conditions: just set $\alpha = 0$, $\beta = 1$. What am I missing?
Sep 16, 2019 at 21:53 history asked Bogdan CC BY-SA 4.0