<p>We consider the existence of at least one positive radially symmetric solution to a class of nonlocal quasilinear PDEs having the form <Equation ID="Equ55"> <EquationSource Format="TEX">\(\begin{aligned} -A\left( \int _{{\mathcal {B}}_1}g\big (u(\varvec{s})\big )~{\textrm{d}}\varvec{s}\right) \Delta _pu=\lambda f\big (|\varvec{x}|,u(\varvec{x})\big ), \quad \varvec{x}\in {\mathcal {B}}_1 \end{aligned}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mtable> <mtr> <mtd columnalign="right"> <mrow> <mo>-</mo> <mi>A</mi> <mfenced close=")" open="("> <msub> <mo>∫</mo> <msub> <mi mathvariant="script">B</mi> <mn>1</mn> </msub> </msub> <mi>g</mi> <mrow> <mo maxsize="1.2em" minsize="1.2em" stretchy="true">(</mo> </mrow> <mi>u</mi> <mrow> <mo stretchy="false">(</mo> <mrow> <mi mathvariant="bold-italic">s</mi> </mrow> <mo stretchy="false">)</mo> </mrow> <mrow> <mo maxsize="1.2em" minsize="1.2em" stretchy="true">)</mo> </mrow> <mspace width="3.33333pt" /> <mtext>d</mtext> <mrow> <mi mathvariant="bold-italic">s</mi> </mrow> </mfenced> <msub> <mi mathvariant="normal">Δ</mi> <mi>p</mi> </msub> <mi>u</mi> <mo>=</mo> <mi>λ</mi> <mi>f</mi> <mrow> <mo maxsize="1.2em" minsize="1.2em" stretchy="true">(</mo> </mrow> <mrow> <mo stretchy="false">|</mo> <mrow> <mi mathvariant="bold-italic">x</mi> </mrow> <mo stretchy="false">|</mo> </mrow> <mo>,</mo> <mi>u</mi> <mrow> <mo stretchy="false">(</mo> <mrow> <mi mathvariant="bold-italic">x</mi> </mrow> <mo stretchy="false">)</mo> </mrow> <mrow> <mo maxsize="1.2em" minsize="1.2em" stretchy="true">)</mo> </mrow> <mo>,</mo> <mspace width="1em" /> <mrow> <mi mathvariant="bold-italic">x</mi> </mrow> <mo>∈</mo> <msub> <mi mathvariant="script">B</mi> <mn>1</mn> </msub> </mrow> </mtd> </mtr> </mtable> </mrow> </math></EquationSource> </Equation>subject to the Dirichlet boundary data <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(u(\varvec{x})=0,\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>u</mi> <mo stretchy="false">(</mo> <mrow> <mi mathvariant="bold-italic">x</mi> </mrow> <mo stretchy="false">)</mo> <mo>=</mo> <mn>0</mn> <mo>,</mo> </mrow> </math></EquationSource> </InlineEquation> <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\varvec{x}\in \partial {\mathcal {B}}_1,\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mrow> <mi mathvariant="bold-italic">x</mi> </mrow> <mo>∈</mo> <mi>∂</mi> <msub> <mi mathvariant="script">B</mi> <mn>1</mn> </msub> <mo>,</mo> </mrow> </math></EquationSource> </InlineEquation> where <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\({\mathcal {B}}_1\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi mathvariant="script">B</mi> <mn>1</mn> </msub> </math></EquationSource> </InlineEquation> is the unit ball in <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\({\mathbb {R}}^{n};\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msup> <mrow> <mi mathvariant="double-struck">R</mi> </mrow> <mi>n</mi> </msup> <mo>;</mo> </mrow> </math></EquationSource> </InlineEquation> here <i>A</i> is a function that captures the nonlocal aspect of the problem. As part of our analysis, we also consider existence of at least one positive solution to the one-dimensional nonlocal <i>p</i>-Laplacian equation <Equation ID="Equ56"> <EquationSource Format="TEX">\(\begin{aligned} -A\left( \big (a*(g\circ u)\big )(1)\right) \big (\varphi _p\circ u'\big )'(t)=\lambda f\big (t,u(t)\big ),\quad 0&lt;t&lt;1, \end{aligned}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mtable> <mtr> <mtd columnalign="right"> <mrow> <mo>-</mo> <mi>A</mi> <mfenced close=")" open="("> <mrow> <mo maxsize="1.2em" minsize="1.2em" stretchy="true">(</mo> </mrow> <mi>a</mi> <mrow /> <mo>∗</mo> <mo stretchy="false">(</mo> <mi>g</mi> <mo>∘</mo> <mi>u</mi> <mo stretchy="false">)</mo> <mrow> <mo maxsize="1.2em" minsize="1.2em" stretchy="true">)</mo> </mrow> <mo stretchy="false">(</mo> <mn>1</mn> <mo stretchy="false">)</mo> </mfenced> <mrow> <mo maxsize="1.2em" minsize="1.2em" stretchy="true">(</mo> </mrow> <msub> <mi>φ</mi> <mi>p</mi> </msub> <mo>∘</mo> <msup> <mi>u</mi> <mo>′</mo> </msup> <msup> <mrow> <mo maxsize="1.2em" minsize="1.2em" stretchy="true">)</mo> </mrow> <mo>′</mo> </msup> <mrow> <mo stretchy="false">(</mo> <mi>t</mi> <mo stretchy="false">)</mo> </mrow> <mo>=</mo> <mi>λ</mi> <mi>f</mi> <mrow> <mo maxsize="1.2em" minsize="1.2em" stretchy="true">(</mo> </mrow> <mi>t</mi> <mo>,</mo> <mi>u</mi> <mrow> <mo stretchy="false">(</mo> <mi>t</mi> <mo stretchy="false">)</mo> </mrow> <mrow> <mo maxsize="1.2em" minsize="1.2em" stretchy="true">)</mo> </mrow> <mo>,</mo> <mspace width="1em" /> <mn>0</mn> <mo>&lt;</mo> <mi>t</mi> <mo>&lt;</mo> <mn>1</mn> <mo>,</mo> </mrow> </mtd> </mtr> </mtable> </mrow> </math></EquationSource> </Equation>subject to the left-focal boundary data <Equation ID="Equ57"> <EquationSource Format="TEX">\(\begin{aligned} u'(0)=0\quad \text {and}\quad u(1)=0. \end{aligned}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mtable> <mtr> <mtd columnalign="right"> <mrow> <msup> <mi>u</mi> <mo>′</mo> </msup> <mrow> <mo stretchy="false">(</mo> <mn>0</mn> <mo stretchy="false">)</mo> </mrow> <mo>=</mo> <mn>0</mn> <mspace width="1em" /> <mtext>and</mtext> <mspace width="1em" /> <mi>u</mi> <mrow> <mo stretchy="false">(</mo> <mn>1</mn> <mo stretchy="false">)</mo> </mrow> <mo>=</mo> <mn>0</mn> <mo>.</mo> </mrow> </mtd> </mtr> </mtable> </mrow> </math></EquationSource> </Equation>Our methodology involves topological fixed point theory. Of special note is that we must analyze a modified problem, which involves a truncation of the forcing term <i>f</i>. This unusual aspect is due to the <i>p</i>-Laplacian operator occurring in the differential equations.</p>

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Positive radial solutions to a class of nonlocal quasilinear equations on the unit ball

  • Christopher S. Goodrich,
  • Tianlan Chen

摘要

We consider the existence of at least one positive radially symmetric solution to a class of nonlocal quasilinear PDEs having the form \(\begin{aligned} -A\left( \int _{{\mathcal {B}}_1}g\big (u(\varvec{s})\big )~{\textrm{d}}\varvec{s}\right) \Delta _pu=\lambda f\big (|\varvec{x}|,u(\varvec{x})\big ), \quad \varvec{x}\in {\mathcal {B}}_1 \end{aligned}\) - A B 1 g ( u ( s ) ) d s Δ p u = λ f ( | x | , u ( x ) ) , x B 1 subject to the Dirichlet boundary data \(u(\varvec{x})=0,\) u ( x ) = 0 , \(\varvec{x}\in \partial {\mathcal {B}}_1,\) x B 1 , where \({\mathcal {B}}_1\) B 1 is the unit ball in \({\mathbb {R}}^{n};\) R n ; here A is a function that captures the nonlocal aspect of the problem. As part of our analysis, we also consider existence of at least one positive solution to the one-dimensional nonlocal p-Laplacian equation \(\begin{aligned} -A\left( \big (a*(g\circ u)\big )(1)\right) \big (\varphi _p\circ u'\big )'(t)=\lambda f\big (t,u(t)\big ),\quad 0<t<1, \end{aligned}\) - A ( a ( g u ) ) ( 1 ) ( φ p u ) ( t ) = λ f ( t , u ( t ) ) , 0 < t < 1 , subject to the left-focal boundary data \(\begin{aligned} u'(0)=0\quad \text {and}\quad u(1)=0. \end{aligned}\) u ( 0 ) = 0 and u ( 1 ) = 0 . Our methodology involves topological fixed point theory. Of special note is that we must analyze a modified problem, which involves a truncation of the forcing term f. This unusual aspect is due to the p-Laplacian operator occurring in the differential equations.