An inquiry on Sobolev space












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Let $widetilde{H}(mathbb{R}^d) = left { f in L^2(mathbb{R}^d): G(xi)mathcal{F}f in L^2(mathbb{R}^d) right}$ and $widetilde{H}(mathbb{R}^d)$ coincides with the Sobolev space $H^beta(mathbb{R}^d)$.



Is the following relationship established?



$m {(1+{left | xi right |}_2^2)}^{beta} leq G(xi) leq M {(1+{left | xi right |}_2^2)}^{beta} quad left | xi right | > xi_0$



for some $m,M >0$ and $xi_0$.










share|cite|improve this question









$endgroup$












  • $begingroup$
    What is $G$?...
    $endgroup$
    – Marvin
    Dec 30 '18 at 17:43










  • $begingroup$
    $G$ is positive real value function.
    $endgroup$
    – Robin denkay
    Jan 2 at 13:02
















0












$begingroup$


Let $widetilde{H}(mathbb{R}^d) = left { f in L^2(mathbb{R}^d): G(xi)mathcal{F}f in L^2(mathbb{R}^d) right}$ and $widetilde{H}(mathbb{R}^d)$ coincides with the Sobolev space $H^beta(mathbb{R}^d)$.



Is the following relationship established?



$m {(1+{left | xi right |}_2^2)}^{beta} leq G(xi) leq M {(1+{left | xi right |}_2^2)}^{beta} quad left | xi right | > xi_0$



for some $m,M >0$ and $xi_0$.










share|cite|improve this question









$endgroup$












  • $begingroup$
    What is $G$?...
    $endgroup$
    – Marvin
    Dec 30 '18 at 17:43










  • $begingroup$
    $G$ is positive real value function.
    $endgroup$
    – Robin denkay
    Jan 2 at 13:02














0












0








0





$begingroup$


Let $widetilde{H}(mathbb{R}^d) = left { f in L^2(mathbb{R}^d): G(xi)mathcal{F}f in L^2(mathbb{R}^d) right}$ and $widetilde{H}(mathbb{R}^d)$ coincides with the Sobolev space $H^beta(mathbb{R}^d)$.



Is the following relationship established?



$m {(1+{left | xi right |}_2^2)}^{beta} leq G(xi) leq M {(1+{left | xi right |}_2^2)}^{beta} quad left | xi right | > xi_0$



for some $m,M >0$ and $xi_0$.










share|cite|improve this question









$endgroup$




Let $widetilde{H}(mathbb{R}^d) = left { f in L^2(mathbb{R}^d): G(xi)mathcal{F}f in L^2(mathbb{R}^d) right}$ and $widetilde{H}(mathbb{R}^d)$ coincides with the Sobolev space $H^beta(mathbb{R}^d)$.



Is the following relationship established?



$m {(1+{left | xi right |}_2^2)}^{beta} leq G(xi) leq M {(1+{left | xi right |}_2^2)}^{beta} quad left | xi right | > xi_0$



for some $m,M >0$ and $xi_0$.







functional-analysis sobolev-spaces






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share|cite|improve this question











share|cite|improve this question




share|cite|improve this question










asked Dec 30 '18 at 12:10









Robin denkayRobin denkay

63




63












  • $begingroup$
    What is $G$?...
    $endgroup$
    – Marvin
    Dec 30 '18 at 17:43










  • $begingroup$
    $G$ is positive real value function.
    $endgroup$
    – Robin denkay
    Jan 2 at 13:02


















  • $begingroup$
    What is $G$?...
    $endgroup$
    – Marvin
    Dec 30 '18 at 17:43










  • $begingroup$
    $G$ is positive real value function.
    $endgroup$
    – Robin denkay
    Jan 2 at 13:02
















$begingroup$
What is $G$?...
$endgroup$
– Marvin
Dec 30 '18 at 17:43




$begingroup$
What is $G$?...
$endgroup$
– Marvin
Dec 30 '18 at 17:43












$begingroup$
$G$ is positive real value function.
$endgroup$
– Robin denkay
Jan 2 at 13:02




$begingroup$
$G$ is positive real value function.
$endgroup$
– Robin denkay
Jan 2 at 13:02










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