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Integral inequality

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Boromir

Banned
Feb 15, 2014
38

Opalg

MHB Oldtimer
Staff member
Feb 7, 2012
2,725
Re: integral inequality

Introduction to Operator Theory and Invariant Subspaces - B. Beauzamy - Google Books


In page 144 of this preview I don't know how they obtain the inequality in (1). It looked like cauchy schwarz but I don't think it is.

I also don't know how they connect the norm of the integral to the supremum of an inner product.

Finally, is it necessary to show the integral is bounded? Is that the motivation?
On my computer, the Google Books preview of this text only goes up to p.139. Please state the problem and its context more explicitly.
 
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Boromir

Banned
Feb 15, 2014
38
Re: integral inequality

On my computer, the Google Books preview of this text only goes up to p.139. Please state the problem and its context more explicitly.
How can it be different for different computers?
 

MarkFL

Administrator
Staff member
Feb 24, 2012
13,775
Re: integral inequality

How can it be different for different computers?
On my computer pages 144-151 are not shown in the preview. It would really be best if you took the time to state the problem yourself.
 

Opalg

MHB Oldtimer
Staff member
Feb 7, 2012
2,725
Re: integral inequality

On my computer, the Google Books preview of this text only goes up to p.139. Please state the problem and its context more explicitly.
How can it be different for different computers?
It depends entirely on what Google's server chooses to send to different users.
 

ThePerfectHacker

Well-known member
Jan 26, 2012
236
Here is what the inequality says. It seems like a bunch of notation is required to be explained to make sense of this. But it seems like Opalg said just CS inequality.

$$
\left| \left< (\int |f| ~ dE)x,y\right> \right|^2 \leq \left< (\int |f| ~ dE)x,x \right> \left< \int (|f| ~ dE)y,y\right> $$