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A Strong Oka Principle for Embeddings of Some Planar Domains into ℂ×ℂ

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Abstract

Gromov, in his seminal 1989 paper on the Oka principle, introduced the notion of an elliptic manifold and proved that every continuous map from a Stein manifold to an elliptic manifold is homotopic to a holomorphic map. We show that a much stronger Oka principle holds in the special case of maps from certain open Riemann surfaces called circular domains into ℂ×ℂ, namely that every continuous map is homotopic to a proper holomorphic embedding. An important ingredient is a generalization to ℂ×ℂ of recent results of Wold and Forstnerič on the long-standing problem of properly embedding open Riemann surfaces into ℂ2, with an additional result on the homotopy class of the embeddings. We also give a complete solution to a question that arises naturally in Lárusson’s holomorphic homotopy theory, of the existence of acyclic embeddings of Riemann surfaces with abelian fundamental group into 2-dimensional elliptic Stein manifolds.

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Correspondence to Tyson Ritter.

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Communicated by Marco Abate.

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Ritter, T. A Strong Oka Principle for Embeddings of Some Planar Domains into ℂ×ℂ . J Geom Anal 23, 571–597 (2013). https://doi.org/10.1007/s12220-011-9254-4

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