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Complex analysis, holomorphic functions, automorphic group actions and forms, pseudoconvexity, complex geometry, analytic spaces, analytic sheaves.

5 votes
Accepted

A question concerning Tauberian theory

The answer is no, even if we assume there are no other poles than $1$ in $\sigma > 1- \epsilon_0$. I give an example below with $\epsilon_0=1$. This is a variant of an example given by Karamata in $19 …
js21's user avatar
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25 votes
Accepted

Why is Oka's coherence theorem a deep result?

In scheme theory applied to complex geometry one usually does not encounter coherent rings which are not noetherian as well. However if $X$ is (for example) a Stein manifold then the ring $R = \mathca …
js21's user avatar
  • 7,249
1 vote
Accepted

Interchanging sums and integrals in a specific instance

Take $f_n(z) = 3z^{3n} - z^n$ and $C = \{ e^{i\theta} \ | \ \theta \in (0,\pi) \}$. It satisfies all of your hypotheses with $$ f(z) = \frac{2+z}{1+z+z^2} $$ and $\int_C f_n =0$ for $n \geq 1$. But $ …
js21's user avatar
  • 7,249
2 votes
Accepted

Can iterates of a non-polynomial function be bounded by an exponential indefinitely?

It is sufficient to find a non-polynomial entire function $f$ such that $T(r) = \sup_{|z| \leq r} |f(z)|$ satisfies $T^{\circ n}(r) = O_n(e^r)$. Let $r \in \mathbb{R}_+ \mapsto S(r) \in \mathbb{R}^*_+ …
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2 votes
Accepted

Bounding function by random sampling

As pointed out by fedja, one can not expect the inequality yo hold with the same epsilon. However, the following holds : if $\mathbf{P}_{z}( |f(z)| \leq \epsilon ) \geq 1 - \delta$, with $\delta \ll n …
js21's user avatar
  • 7,249
5 votes

Complete subring of F_p[[X]]

No : just take $A = \mathbb{F}_p$. This is the only counterexample : any complete local sub-algebra $\iota_A \colon A \hookrightarrow {\Bbb F}_p[[X]]$, with $A \neq \mathbb{F}_p$, is noetherian of Kr …
js21's user avatar
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11 votes
5 answers
4k views

Applications of Liouville's theorem

I'm looking for "nice" applications of Liouville's theorem (every bounded entire map is constant) outside the area of complex analysis. An example of what I'm not looking for : a non-constant entire …