<p>This work is devoted to investigating a Dirichlet problem for a system of double phase equations with variable exponents. The system is defined as follows: <Equation ID="Equa"> <EquationSource Format="MATHML"><math> <mrow> <mo>{</mo> <mtable> <mtr> <mtd columnalign="left"> <mo>−</mo> <mo>div</mo> <mrow> <mo>(</mo> <mo stretchy="false">|</mo> <mi mathvariant="normal">∇</mi> <mi>ϕ</mi> <msup> <mo stretchy="false">|</mo> <mrow> <msub> <mi>α</mi> <mn>1</mn> </msub> <mo stretchy="false">(</mo> <mi>y</mi> <mo stretchy="false">)</mo> <mo>−</mo> <mn>2</mn> </mrow> </msup> <mi mathvariant="normal">∇</mi> <mi>ϕ</mi> <mo>+</mo> <msub> <mi>μ</mi> <mn>1</mn> </msub> <mo stretchy="false">(</mo> <mi>y</mi> <mo stretchy="false">)</mo> <mo stretchy="false">|</mo> <mi mathvariant="normal">∇</mi> <mi>ϕ</mi> <msup> <mo stretchy="false">|</mo> <mrow> <msub> <mi>β</mi> <mn>1</mn> </msub> <mo stretchy="false">(</mo> <mi>y</mi> <mo stretchy="false">)</mo> <mo>−</mo> <mn>2</mn> </mrow> </msup> <mi mathvariant="normal">∇</mi> <mi>ϕ</mi> <mo>)</mo> </mrow> <mo>=</mo> <msub> <mi>f</mi> <mn>1</mn> </msub> <mo stretchy="false">(</mo> <mi>ϕ</mi> <mo>,</mo> <mi>φ</mi> <mo stretchy="false">)</mo> </mtd> <mtd columnalign="left"> <mtext>in&#xa0;</mtext> <mi mathvariant="normal">ϒ</mi> <mo>,</mo> </mtd> </mtr> <mtr> <mtd columnalign="left"> <mo>−</mo> <mo>div</mo> <mrow> <mo>(</mo> <mo stretchy="false">|</mo> <mi mathvariant="normal">∇</mi> <mi>φ</mi> <msup> <mo stretchy="false">|</mo> <mrow> <msub> <mi>α</mi> <mn>2</mn> </msub> <mo stretchy="false">(</mo> <mi>y</mi> <mo stretchy="false">)</mo> <mo>−</mo> <mn>2</mn> </mrow> </msup> <mi mathvariant="normal">∇</mi> <mi>φ</mi> <mo>+</mo> <msub> <mi>μ</mi> <mn>2</mn> </msub> <mo stretchy="false">(</mo> <mi>y</mi> <mo stretchy="false">)</mo> <mo stretchy="false">|</mo> <mi mathvariant="normal">∇</mi> <mi>φ</mi> <msup> <mo stretchy="false">|</mo> <mrow> <msub> <mi>β</mi> <mn>2</mn> </msub> <mo stretchy="false">(</mo> <mi>y</mi> <mo stretchy="false">)</mo> <mo>−</mo> <mn>2</mn> </mrow> </msup> <mi mathvariant="normal">∇</mi> <mi>φ</mi> <mo>)</mo> </mrow> <mo>=</mo> <msub> <mi>f</mi> <mn>2</mn> </msub> <mo stretchy="false">(</mo> <mi>ϕ</mi> <mo>,</mo> <mi>φ</mi> <mo stretchy="false">)</mo> </mtd> <mtd columnalign="left"> <mtext>in&#xa0;</mtext> <mi mathvariant="normal">ϒ</mi> <mo>,</mo> </mtd> </mtr> <mtr> <mtd columnalign="left"> <mi>ϕ</mi> <mo>=</mo> <mn>0</mn> <mo>,</mo> <mspace width="1em" /> <mi>φ</mi> <mo>=</mo> <mn>0</mn> </mtd> <mtd columnalign="left"> <mtext>on&#xa0;</mtext> <mi>∂</mi> <mi mathvariant="normal">ϒ</mi> <mo>,</mo> </mtd> </mtr> </mtable> </mrow> </math></EquationSource> <EquationSource Format="TEX">\( \textstyle\begin{cases} -\operatorname{div}\left (|\nabla \phi |^{\alpha _{1}(y)-2}\nabla \phi + \mu _{1}(y)|\nabla \phi |^{\beta _{1}(y)-2}\nabla \phi \right ) = f_{1}(\phi ,\varphi ) &amp; \text{in } \Upsilon , \\ -\operatorname{div}\left (|\nabla \varphi |^{\alpha _{2}(y)-2}\nabla \varphi + \mu _{2}(y)|\nabla \varphi |^{\beta _{2}(y)-2}\nabla \varphi \right ) = f_{2}(\phi ,\varphi ) &amp; \text{in } \Upsilon , \\ \phi = 0, \quad \varphi = 0 &amp; \text{on } \partial \Upsilon , \end{cases} \)</EquationSource> </Equation> where <InlineEquation ID="IEq1"> <EquationSource Format="MATHML"><math> <mi mathvariant="normal">ϒ</mi> <mo>⊂</mo> <msup> <mi mathvariant="double-struck">R</mi> <mi>N</mi> </msup> </math></EquationSource> <EquationSource Format="TEX">$\Upsilon \subset \mathbb{R}^{N}$</EquationSource> </InlineEquation> denotes a bounded domain with a smooth boundary. Using a variational principle introduced by B.&#xa0;Ricceri and critical point theory in the setting of variable exponent Sobolev spaces, we prove that the system admits infinitely many weak solutions.</p>

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Infinitely many solutions to a system of double phase equations with variable exponents and Dirichlet conditions

  • Ahmed Ahmed,
  • Mohamed Saad Bouh Elemine Vall,
  • Rafik Guefaifia,
  • Salah Boulaaras

摘要

This work is devoted to investigating a Dirichlet problem for a system of double phase equations with variable exponents. The system is defined as follows: { div ( | ϕ | α 1 ( y ) 2 ϕ + μ 1 ( y ) | ϕ | β 1 ( y ) 2 ϕ ) = f 1 ( ϕ , φ ) in  ϒ , div ( | φ | α 2 ( y ) 2 φ + μ 2 ( y ) | φ | β 2 ( y ) 2 φ ) = f 2 ( ϕ , φ ) in  ϒ , ϕ = 0 , φ = 0 on  ϒ , \( \textstyle\begin{cases} -\operatorname{div}\left (|\nabla \phi |^{\alpha _{1}(y)-2}\nabla \phi + \mu _{1}(y)|\nabla \phi |^{\beta _{1}(y)-2}\nabla \phi \right ) = f_{1}(\phi ,\varphi ) & \text{in } \Upsilon , \\ -\operatorname{div}\left (|\nabla \varphi |^{\alpha _{2}(y)-2}\nabla \varphi + \mu _{2}(y)|\nabla \varphi |^{\beta _{2}(y)-2}\nabla \varphi \right ) = f_{2}(\phi ,\varphi ) & \text{in } \Upsilon , \\ \phi = 0, \quad \varphi = 0 & \text{on } \partial \Upsilon , \end{cases} \) where ϒ R N $\Upsilon \subset \mathbb{R}^{N}$ denotes a bounded domain with a smooth boundary. Using a variational principle introduced by B. Ricceri and critical point theory in the setting of variable exponent Sobolev spaces, we prove that the system admits infinitely many weak solutions.