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[Merged by Bors] - feat(analysis/complex/liouville): prove Liouville's theorem #12095
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I think this looks good, aside from the naming comments below. It is certainly enough for basic applications of Liouville's theorem. I have already used it for showing the spectrum is nonempty.
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feat(analysis/complex/liouville): prove Liouville's theorem
[Merged by Bors] - feat(analysis/complex/liouville): prove Liouville's theorem
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… the spectrum of any element in a complex Banach algebra is nonempty (#12115) This establishes that the spectrum of any element in a (nontrivial) complex Banach algebra is nonempty. The nontrivial assumption is necessary, as otherwise the only element is invertible. In addition, we establish some properties of the resolvent function; in particular, it tends to zero at infinity. - [x] depends on: #12095 Co-authored-by: Yury G. Kudryashov <urkud@urkud.name>
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This statement is already useful but we should generalize later.