We study non-tangentially accessible (NTA) domains for diagonal vector fields. We introduce a geometric no- tion of “admissible boundary” ensuring the NTA property. For general Hormander vector fields, we prove that a domain with non characteristic boundary is NTA.
Non-tangentially accessible domains for vector fields
MONTI, ROBERTO;
2005
Abstract
We study non-tangentially accessible (NTA) domains for diagonal vector fields. We introduce a geometric no- tion of “admissible boundary” ensuring the NTA property. For general Hormander vector fields, we prove that a domain with non characteristic boundary is NTA.
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