How to prove that solutions of semilinear differential equations is even function?
My question comes from the book Stable Solutions of Elliptic Partial Differential Equations Louis Dupaigne, pages 30-32.
Summary: Which uniqueness theorem to use for this differential equation ?
I am working with the following semilinear differential equation
Uniqueness
I want to prove that the solutions are even. After verifying that
I have been searching but have not found any theorem applicable to this case. In Dupaigne's book, one could use Proposition 1.3.1 on page 15, but the problem here is that the solutions, (I'm not sure), are minimal and maximal and that proposition is only valid for stable solutions, and since the maximal solution has a Morse index different from zero, it isn't stable.
Even
The verification that it is an even function is immediate.
Let
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