English

On q-Runge domains

Complex Variables 2008-12-31 v1

Abstract

In [2][2], Coltoiu gave an example of a domain D\complexes6D\subset\complexes^{6} which is 4-complete such that for every FCoh(\complexes6){\mathcal{F}}\in Coh(\complexes^{6}) the restriction map H3(\complexes6,F)H3(D,F)H^{3}(\complexes^{6},{\mathcal{F}})\to H^{3}(D,{\mathcal{F}}) has a dense image but DD is not 4-Runge in \complexes6\complexes^{6}. Here, we prove that for every integers n4n\geq 4 and 1qn1\leq q\leq n there exists a domain D\complexesnD\subset \complexes^{n} which is not (q~1\tilde{q}-1)-Runge in \complexesn\complexes^{n} but such that for any coherent analytic sheaf F{\mathcal{F}} on \complexesn\complexes^{n} the restriction map Hp(\complexesn,F)H3(D,F)H^{p}(\complexes^{n},{\mathcal{F}})\to H^{3}(D,{\mathcal{F}}) has a dense image for all pq~2p\geq \tilde{q}-2 if qq does not divide nn, where q~=n[nq]+1\tilde{q}=n-[\frac{n}{q}]+1 and [nq][\frac{n}{q}] denotes the integral part of nq\frac{n}{q}.

Keywords

Cite

@article{arxiv.0812.4697,
  title  = {On q-Runge domains},
  author = {Youssef Alaoui},
  journal= {arXiv preprint arXiv:0812.4697},
  year   = {2008}
}
R2 v1 2026-06-21T11:55:54.810Z