Question on embeddings of $W^{2,p}(partial U)$ space












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I sense that my question might be elementary but I'm quite puzzled about the following:



Let $U subset mathbb R^3$ be an open, bounded and connected set with $C^2-$regular boundary $partial U$. If $f in W^{2,p}(partial U)$ then what is the dimension that I consider in order to use Sobolev embeddings?



Is it true that $n=3$? But how is that possible, since the area of $partial U$ is the $2-$dimensional Hausdorff measure?



Moreover, considering $x_0 in partial U$ then a function $g: B(x_0,r) to mathbb R$ is a function of $2$ or $3$ variables?



I'm pretty sure that I have confused some definitions here so I would appreciate if somebody could help me enlighten this area.



Thank you very much in advance!










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    0












    $begingroup$


    I sense that my question might be elementary but I'm quite puzzled about the following:



    Let $U subset mathbb R^3$ be an open, bounded and connected set with $C^2-$regular boundary $partial U$. If $f in W^{2,p}(partial U)$ then what is the dimension that I consider in order to use Sobolev embeddings?



    Is it true that $n=3$? But how is that possible, since the area of $partial U$ is the $2-$dimensional Hausdorff measure?



    Moreover, considering $x_0 in partial U$ then a function $g: B(x_0,r) to mathbb R$ is a function of $2$ or $3$ variables?



    I'm pretty sure that I have confused some definitions here so I would appreciate if somebody could help me enlighten this area.



    Thank you very much in advance!










    share|cite|improve this question









    $endgroup$















      0












      0








      0


      1



      $begingroup$


      I sense that my question might be elementary but I'm quite puzzled about the following:



      Let $U subset mathbb R^3$ be an open, bounded and connected set with $C^2-$regular boundary $partial U$. If $f in W^{2,p}(partial U)$ then what is the dimension that I consider in order to use Sobolev embeddings?



      Is it true that $n=3$? But how is that possible, since the area of $partial U$ is the $2-$dimensional Hausdorff measure?



      Moreover, considering $x_0 in partial U$ then a function $g: B(x_0,r) to mathbb R$ is a function of $2$ or $3$ variables?



      I'm pretty sure that I have confused some definitions here so I would appreciate if somebody could help me enlighten this area.



      Thank you very much in advance!










      share|cite|improve this question









      $endgroup$




      I sense that my question might be elementary but I'm quite puzzled about the following:



      Let $U subset mathbb R^3$ be an open, bounded and connected set with $C^2-$regular boundary $partial U$. If $f in W^{2,p}(partial U)$ then what is the dimension that I consider in order to use Sobolev embeddings?



      Is it true that $n=3$? But how is that possible, since the area of $partial U$ is the $2-$dimensional Hausdorff measure?



      Moreover, considering $x_0 in partial U$ then a function $g: B(x_0,r) to mathbb R$ is a function of $2$ or $3$ variables?



      I'm pretty sure that I have confused some definitions here so I would appreciate if somebody could help me enlighten this area.



      Thank you very much in advance!







      functional-analysis differential-geometry pde sobolev-spaces






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      share|cite|improve this question











      share|cite|improve this question




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      asked Jan 8 at 11:19









      kaithkolesidoukaithkolesidou

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