<p>We construct a connected, compact set <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(K \subset \mathbb {C}^2\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>K</mi> <mo>⊂</mo> <msup> <mrow> <mi mathvariant="double-struck">C</mi> </mrow> <mn>2</mn> </msup> </mrow> </math></EquationSource> </InlineEquation> with the following property: there exist points <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(p \in \hat{K} {\setminus } K\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>p</mi> <mo>∈</mo> <mover accent="true"> <mi>K</mi> <mo stretchy="false">^</mo> </mover> <mo lspace="0.15em" rspace="0.15em" stretchy="false">\</mo> <mi>K</mi> </mrow> </math></EquationSource> </InlineEquation> such that there does not exist a sequence <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\{A_\nu \}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo stretchy="false">{</mo> <msub> <mi>A</mi> <mi>ν</mi> </msub> <mo stretchy="false">}</mo> </mrow> </math></EquationSource> </InlineEquation> of analytic sets <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(A_\nu \subset \subset \mathbb {C}^2\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>A</mi> <mi>ν</mi> </msub> <mo>⊂</mo> <mo>⊂</mo> <msup> <mrow> <mi mathvariant="double-struck">C</mi> </mrow> <mn>2</mn> </msup> </mrow> </math></EquationSource> </InlineEquation> with boundary satisfying <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(p \in A_\nu \)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>p</mi> <mo>∈</mo> <msub> <mi>A</mi> <mi>ν</mi> </msub> </mrow> </math></EquationSource> </InlineEquation> for every <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(\nu \in \mathbb {N}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>ν</mi> <mo>∈</mo> <mi mathvariant="double-struck">N</mi> </mrow> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\(\lim _{\nu \rightarrow \infty } bA_\nu \subset K\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mo movablelimits="true">lim</mo> <mrow> <mi>ν</mi> <mo stretchy="false">→</mo> <mi>∞</mi> </mrow> </msub> <mi>b</mi> <msub> <mi>A</mi> <mi>ν</mi> </msub> <mo>⊂</mo> <mi>K</mi> </mrow> </math></EquationSource> </InlineEquation>. For every point in <InlineEquation ID="IEq8"> <EquationSource Format="TEX">\(\hat{K} {\setminus } K\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mover accent="true"> <mi>K</mi> <mo stretchy="false">^</mo> </mover> <mo lspace="0.15em" rspace="0.15em" stretchy="false">\</mo> <mi>K</mi> </mrow> </math></EquationSource> </InlineEquation>, we explicitly construct a sequence of Poletsky discs, and we compute the weak limit of the pushforwards of the Green current under these discs.</p>

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Approximation of polynomial hulls by analytic varieties: a counterexample

  • Tobias Harz

摘要

We construct a connected, compact set \(K \subset \mathbb {C}^2\) K C 2 with the following property: there exist points \(p \in \hat{K} {\setminus } K\) p K ^ \ K such that there does not exist a sequence \(\{A_\nu \}\) { A ν } of analytic sets \(A_\nu \subset \subset \mathbb {C}^2\) A ν C 2 with boundary satisfying \(p \in A_\nu \) p A ν for every \(\nu \in \mathbb {N}\) ν N and \(\lim _{\nu \rightarrow \infty } bA_\nu \subset K\) lim ν b A ν K . For every point in \(\hat{K} {\setminus } K\) K ^ \ K , we explicitly construct a sequence of Poletsky discs, and we compute the weak limit of the pushforwards of the Green current under these discs.