<p>We study a nonlinear Steklov problem involving weighted <i>p</i>(.)-Laplacian-like operator. Using some variational methods, we obtain the existence and multiplicity of solutions for the following problem <Equation ID="Equ14"> <EquationSource Format="TEX">\(\begin{aligned} \left\{ \begin{array}{cc} \text {div}\left( \left( 1+\frac{\left| \nabla u\right| ^{p(x)}}{ \sqrt{1+\left| \nabla u\right| ^{2p(x)}}}\right) a(x)\left| \nabla u\right| ^{p(x)-2}\nabla u\right) =b(x)\left| u\right| ^{p(x)-2}u, &amp; \text {in }\Omega \\ \left( 1+\frac{\left| \nabla u\right| ^{p(x)}}{\sqrt{1+\left| \nabla u\right| ^{2p(x)}}}\right) a(x)\left| \nabla u\right| ^{p(x)-2}\frac{\partial u}{\partial \upsilon }=\lambda f(x,u), &amp; \text {on } \partial \Omega ,\end{array} \right. \end{aligned}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mtable> <mtr> <mtd columnalign="right"> <mfenced open="{"> <mrow> <mtable> <mtr> <mtd> <mrow> <mtext>div</mtext> <mfenced close=")" open="("> <mfenced close=")" open="("> <mn>1</mn> <mo>+</mo> <mfrac> <msup> <mfenced close="|" open="|"> <mi mathvariant="normal">∇</mi> <mi>u</mi> </mfenced> <mrow> <mi>p</mi> <mo stretchy="false">(</mo> <mi>x</mi> <mo stretchy="false">)</mo> </mrow> </msup> <msqrt> <mrow> <mn>1</mn> <mo>+</mo> <msup> <mfenced close="|" open="|"> <mi mathvariant="normal">∇</mi> <mi>u</mi> </mfenced> <mrow> <mn>2</mn> <mi>p</mi> <mo stretchy="false">(</mo> <mi>x</mi> <mo stretchy="false">)</mo> </mrow> </msup> </mrow> </msqrt> </mfrac> </mfenced> <mi>a</mi> <mrow> <mo stretchy="false">(</mo> <mi>x</mi> <mo stretchy="false">)</mo> </mrow> <msup> <mfenced close="|" open="|"> <mi mathvariant="normal">∇</mi> <mi>u</mi> </mfenced> <mrow> <mi>p</mi> <mo stretchy="false">(</mo> <mi>x</mi> <mo stretchy="false">)</mo> <mo>-</mo> <mn>2</mn> </mrow> </msup> <mi mathvariant="normal">∇</mi> <mi>u</mi> </mfenced> <mo>=</mo> <mi>b</mi> <mrow> <mo stretchy="false">(</mo> <mi>x</mi> <mo stretchy="false">)</mo> </mrow> <msup> <mfenced close="|" open="|"> <mi>u</mi> </mfenced> <mrow> <mi>p</mi> <mo stretchy="false">(</mo> <mi>x</mi> <mo stretchy="false">)</mo> <mo>-</mo> <mn>2</mn> </mrow> </msup> <mi>u</mi> <mo>,</mo> </mrow> </mtd> <mtd> <mrow> <mtext>in</mtext> <mspace width="0.333333em" /> <mi mathvariant="normal">Ω</mi> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mrow /> <mfenced close=")" open="("> <mn>1</mn> <mo>+</mo> <mfrac> <msup> <mfenced close="|" open="|"> <mi mathvariant="normal">∇</mi> <mi>u</mi> </mfenced> <mrow> <mi>p</mi> <mo stretchy="false">(</mo> <mi>x</mi> <mo stretchy="false">)</mo> </mrow> </msup> <msqrt> <mrow> <mn>1</mn> <mo>+</mo> <msup> <mfenced close="|" open="|"> <mi mathvariant="normal">∇</mi> <mi>u</mi> </mfenced> <mrow> <mn>2</mn> <mi>p</mi> <mo stretchy="false">(</mo> <mi>x</mi> <mo stretchy="false">)</mo> </mrow> </msup> </mrow> </msqrt> </mfrac> </mfenced> <mi>a</mi> <mrow> <mo stretchy="false">(</mo> <mi>x</mi> <mo stretchy="false">)</mo> </mrow> <msup> <mfenced close="|" open="|"> <mi mathvariant="normal">∇</mi> <mi>u</mi> </mfenced> <mrow> <mi>p</mi> <mo stretchy="false">(</mo> <mi>x</mi> <mo stretchy="false">)</mo> <mo>-</mo> <mn>2</mn> </mrow> </msup> <mfrac> <mrow> <mi>∂</mi> <mi>u</mi> </mrow> <mrow> <mi>∂</mi> <mi>υ</mi> </mrow> </mfrac> <mo>=</mo> <mi>λ</mi> <mi>f</mi> <mrow> <mo stretchy="false">(</mo> <mi>x</mi> <mo>,</mo> <mi>u</mi> <mo stretchy="false">)</mo> </mrow> <mo>,</mo> </mrow> </mtd> <mtd> <mrow> <mtext>on</mtext> <mspace width="0.333333em" /> <mi>∂</mi> <mi mathvariant="normal">Ω</mi> <mo>,</mo> </mrow> </mtd> </mtr> </mtable> </mrow> </mfenced> </mtd> </mtr> </mtable> </mrow> </math></EquationSource> </Equation>under some suitable conditions.</p>

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Multiplicity of weak solutions to Steklov problem involving weighted p(.)-Laplacian-like operator

  • Ismail Aydin

摘要

We study a nonlinear Steklov problem involving weighted p(.)-Laplacian-like operator. Using some variational methods, we obtain the existence and multiplicity of solutions for the following problem \(\begin{aligned} \left\{ \begin{array}{cc} \text {div}\left( \left( 1+\frac{\left| \nabla u\right| ^{p(x)}}{ \sqrt{1+\left| \nabla u\right| ^{2p(x)}}}\right) a(x)\left| \nabla u\right| ^{p(x)-2}\nabla u\right) =b(x)\left| u\right| ^{p(x)-2}u, & \text {in }\Omega \\ \left( 1+\frac{\left| \nabla u\right| ^{p(x)}}{\sqrt{1+\left| \nabla u\right| ^{2p(x)}}}\right) a(x)\left| \nabla u\right| ^{p(x)-2}\frac{\partial u}{\partial \upsilon }=\lambda f(x,u), & \text {on } \partial \Omega ,\end{array} \right. \end{aligned}\) div 1 + u p ( x ) 1 + u 2 p ( x ) a ( x ) u p ( x ) - 2 u = b ( x ) u p ( x ) - 2 u , in Ω 1 + u p ( x ) 1 + u 2 p ( x ) a ( x ) u p ( x ) - 2 u υ = λ f ( x , u ) , on Ω , under some suitable conditions.