<p>We analyze the asymptotic behavior near the boundary of viscosity solutions to the singular problem <Equation ID="Equ19"> <EquationSource Format="TEX">\(\begin{aligned} \left\{ \begin{array}{ll} \Delta _\infty ^h u=-b(x)g(u) \quad &amp; \textrm{in}\, \Omega , \\ u&gt;0 \quad &amp; \textrm{in}\, \Omega , \\ u=0 \quad &amp; \textrm{on} \,\partial \Omega , \end{array}\right. \end{aligned}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mtable> <mtr> <mtd columnalign="right"> <mfenced open="{"> <mrow> <mtable> <mtr> <mtd columnalign="left"> <mrow> <msubsup> <mi mathvariant="normal">Δ</mi> <mi>∞</mi> <mi>h</mi> </msubsup> <mi>u</mi> <mo>=</mo> <mo>-</mo> <mi>b</mi> <mrow> <mo stretchy="false">(</mo> <mi>x</mi> <mo stretchy="false">)</mo> </mrow> <mi>g</mi> <mrow> <mo stretchy="false">(</mo> <mi>u</mi> <mo stretchy="false">)</mo> </mrow> <mspace width="1em" /> </mrow> </mtd> <mtd columnalign="left"> <mrow> <mtext>in</mtext> <mspace width="0.166667em" /> <mi mathvariant="normal">Ω</mi> <mo>,</mo> </mrow> </mtd> </mtr> <mtr> <mtd columnalign="left"> <mrow> <mrow /> <mi>u</mi> <mo>&gt;</mo> <mn>0</mn> <mspace width="1em" /> </mrow> </mtd> <mtd columnalign="left"> <mrow> <mtext>in</mtext> <mspace width="0.166667em" /> <mi mathvariant="normal">Ω</mi> <mo>,</mo> </mrow> </mtd> </mtr> <mtr> <mtd columnalign="left"> <mrow> <mrow /> <mi>u</mi> <mo>=</mo> <mn>0</mn> <mspace width="1em" /> </mrow> </mtd> <mtd columnalign="left"> <mrow> <mtext>on</mtext> <mspace width="0.166667em" /> <mi>∂</mi> <mi mathvariant="normal">Ω</mi> <mo>,</mo> </mrow> </mtd> </mtr> </mtable> </mrow> </mfenced> </mtd> </mtr> </mtable> </mrow> </math></EquationSource> </Equation>where <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(h&gt;1,\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>h</mi> <mo>&gt;</mo> <mn>1</mn> <mo>,</mo> </mrow> </math></EquationSource> </InlineEquation> <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\Delta _\infty ^h u=|Du|^{h-3}\Delta _\infty u \)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msubsup> <mi mathvariant="normal">Δ</mi> <mi>∞</mi> <mi>h</mi> </msubsup> <mi>u</mi> <mo>=</mo> <msup> <mrow> <mo stretchy="false">|</mo> <mi>D</mi> <mi>u</mi> <mo stretchy="false">|</mo> </mrow> <mrow> <mi>h</mi> <mo>-</mo> <mn>3</mn> </mrow> </msup> <msub> <mi mathvariant="normal">Δ</mi> <mi>∞</mi> </msub> <mi>u</mi> </mrow> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\Delta _\infty u=\langle D^2uDu,Du \rangle \)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi mathvariant="normal">Δ</mi> <mi>∞</mi> </msub> <mi>u</mi> <mo>=</mo> <mrow> <mo stretchy="false">⟨</mo> <msup> <mi>D</mi> <mn>2</mn> </msup> <mi>u</mi> <mi>D</mi> <mi>u</mi> <mo>,</mo> <mi>D</mi> <mi>u</mi> <mo stretchy="false">⟩</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> is the infinity Laplacian which is strongly degenerate, quasilinear and arising from the absolutely minimizing Lipschitz extension. Our main result concerns the case when the nonlinearity <i>g</i> is regularly varying at zero with index <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(-h\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo>-</mo> <mi>h</mi> </mrow> </math></EquationSource> </InlineEquation>.</p>

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Asymptotic estimates of viscosity solutions to the singular boundary problem of infinity Laplace equations

  • Xianbin Kang,
  • Fang Liu,
  • Haonan Wang

摘要

We analyze the asymptotic behavior near the boundary of viscosity solutions to the singular problem \(\begin{aligned} \left\{ \begin{array}{ll} \Delta _\infty ^h u=-b(x)g(u) \quad & \textrm{in}\, \Omega , \\ u>0 \quad & \textrm{in}\, \Omega , \\ u=0 \quad & \textrm{on} \,\partial \Omega , \end{array}\right. \end{aligned}\) Δ h u = - b ( x ) g ( u ) in Ω , u > 0 in Ω , u = 0 on Ω , where \(h>1,\) h > 1 , \(\Delta _\infty ^h u=|Du|^{h-3}\Delta _\infty u \) Δ h u = | D u | h - 3 Δ u and \(\Delta _\infty u=\langle D^2uDu,Du \rangle \) Δ u = D 2 u D u , D u is the infinity Laplacian which is strongly degenerate, quasilinear and arising from the absolutely minimizing Lipschitz extension. Our main result concerns the case when the nonlinearity g is regularly varying at zero with index \(-h\) - h .