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when toggle format what by license comment
Apr 27, 2022 at 23:11 history edited Buzz CC BY-SA 4.0
added 31 characters in body
Nov 3, 2021 at 1:02 comment added Zac Thanks. What if we consider $-\Delta u +\lambda u= 0$? Then $u \equiv 1$ is no longer a solution.
Nov 3, 2021 at 0:40 history answered Buzz CC BY-SA 4.0