2013•arXiv (Cornell University)Open access

Computing boundary extensions of conformal maps onto domains with uncontrollably wiggly boundaries

Timothy H. McNicholl

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Abstract

It is shown that there is a computable conformal map of the unit disk onto a domain $D$ that has a computable extension to the closure of the unit disk even though the boundary of $D$ is not effectively locally connected. The proof encodes an arbitrary \emph{c.e.} set into the local connectivity of the boundary of $D$.

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What this paper is about

It is shown that there is a computable conformal map of the unit disk onto a domain $D$ that has a computable extension to the closure of the unit disk even though the boundary of $D$ is not effectively locally connected. The proof encodes an arbitrary \emph{c.e.} set into the local connectivity of the boundary of $D$.

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Available abstract

It is shown that there is a computable conformal map of the unit disk onto a domain $D$ that has a computable extension to the closure of the unit disk even though the boundary of $D$ is not effectively locally connected. The proof encodes an arbitrary \emph{c.e.} set into the local connectivity of the boundary of $D$.

Key concepts: Unit disk, Conformal map, Boundary (topology), Extension (predicate logic), Closure (psychology), Domain (mathematical analysis), Unit (ring theory), Set (abstract data type)

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