How Does Sobolev Space Boundedness Relate to Different Norms in $R^n$?

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Discussion Overview

The discussion revolves around the relationship between Sobolev space boundedness and different norms in \( \mathbb{R}^n \). Participants explore the implications of boundedness in Sobolev spaces, particularly in the context of tempered distributions and the significance of the domain of the function involved.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant presents a mathematical statement regarding Sobolev norms and asks for guidance on how to approach the problem.
  • Another participant notes that crucial information is missing from the problem statement, specifically the domain of the function \( f \).
  • A subsequent participant clarifies that \( f \) is a tempered distribution.
  • Further clarification is sought regarding the specific space \( H^t(X) \) and its domain \( X \), emphasizing that the nature of \( X \) affects the integration process.
  • It is confirmed that the domain in question is \( \mathbb{R}^n \).

Areas of Agreement / Disagreement

Participants generally agree on the need for clarity regarding the domain of the function, but the discussion remains unresolved regarding the implications of this boundedness in Sobolev spaces.

Contextual Notes

The discussion highlights the importance of the domain in the context of Sobolev spaces, indicating that different domains may lead to different interpretations or applications of the norms involved.

Who May Find This Useful

Researchers and students interested in functional analysis, Sobolev spaces, and the properties of tempered distributions in various domains.

Danny2
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If $ r<s<t $ then for any $ ϵ>0 $there exists $ C>0 $ such that $ ∥f∥_{(s)}≤ϵ∥f∥_{(t)}+C∥f∥_{(r)} $for all $f∈H_t $

Can you please tell me how to start thinking of this problem? I really feel stuck and don't know where to start!
 
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Welcome, Danny! (Wave)

Some information is missing in the problem statement. What is the domain of $f$?
 
$f$ is a tempered distribution
 
What I mean is this: $f\in H^t(X)$ for some space $X$ -- what is $X$? It makes a difference, since, e.g., integration on the torus is different from integration on $\Bbb R^n$.
 
$R^n$
 

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