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L^/infinity functions   Message List  
Reply | Forward Message #362 of 456 |
Re: [harmonic] L^/infinity functions

Hi
Thanks. I got similar mails from others saying it is
not true. I havnt checked a counterexample yet, but
I'll do it.
In page 192 of Rudin's "Real and Complex Analysis", he
uses a /beta which is in L^/infinity and then he says
(after equation (5)) that by changing /beta(y)on a set
of measure 0 we may assume it is continuous. If you
have some time to spare can u pl. go through this pf
and explain that step?
Thank you very much
regards,
gowri

--- venku naidu <venku_uoh@...> wrote:

> Hai,
> I think that is not true in general. Particular
> you can visualise this by taking a step function on
> a bounded interval.
> bye....
>
> wilson@... wrote:
> Quoting gnavada <gnavada@...>:
>
> It's false.
>
> > Hello,
> > I need a proof of the following fact: L^/infinity
> functions in R can
> > be made continuous by changing the values of
> functions on a set of
> > measure zero. Even a reference to the proof will
> help.
> > thanks
> > gowri
> >
> >
>
>
>
>
>
>
> D.VENKU NAIDU,
> CAUVERY HOSTEL,
> ROOM NO:2045,
> IIT,MADRAS,
> CHENNAI-36
>
>
> ---------------------------------
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Wed Feb 14, 2007 6:07 am

gnavada
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Message #362 of 456 |
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Hello, I need a proof of the following fact: L^/infinity functions in R can be made continuous by changing the values of functions on a set of measure zero....
gnavada
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Feb 13, 2007
5:15 pm

What you want is not true. The fact you mean is that you can do it with a set of arbitrary small measure....
Maria Roginskaya
maria@...
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Feb 13, 2007
5:22 pm

Quoting gnavada <gnavada@...>: It's false....
wilson@...
obscureveryo...
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Feb 13, 2007
6:11 pm

Hai, I think that is not true in general. Particular you can visualise this by taking a step function on a bounded interval. bye.... wilson@... wrote:...
venku naidu
venku_uoh
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Feb 14, 2007
4:29 am

Hi Thanks. I got similar mails from others saying it is not true. I havnt checked a counterexample yet, but I'll do it. In page 192 of Rudin's "Real and...
Gowri Navada
gnavada
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Feb 14, 2007
3:57 pm

Hi Gowri, Look at equation (5) on pg. 192. We assumed, that \phi(f) is not zero and that \beta(y) is in L^\infinity. On the other hand, since the map f \to f_y...
Bela A. Frigyik
frigyik
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Feb 14, 2007
7:35 pm

Hi Gowri; I think the best you can do in approximating such function is Lusin's Theorem, which is sometimes very useful. Anyways, here I provide a counter...
zaher_hani
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Mar 4, 2007
3:17 am
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