Related to the question : Eigenvalues of the circle over the Laplacian operator, what kind of periodic chart $c:(-\pi,\pi)\rightarrow S^1$ has the property that for a continuous function $f$, $g :=f \circ c$ is periodic, and such that $g'' = \lambda g$ as in the Thomas's comment?
2026-04-02 03:55:37.1775102137
Periodic function with the capacity of being $g'' = \lambda g$
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