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Re: Prime ideals in the ring of continuous functions

Subject: Re: Prime ideals in the ring of continuous functions
From: Timothy Murphy
Date: Sat, 21 Oct 2006 14:19:49 +0100
Newsgroups: sci.math
Jannick Asmus wrote:

> On 21.10.2006 09:33, Sasha P wrote:
> 
>> Consider ideal
>> I={f \in C[0,1] : lim_{x \to 0} f(x)/x^n=0, n=0,1,2,â??}
>> Is I prime ideal?
> 
> At least I is radical, i.e. if f^n in I for some n>0, then f in I. This
> is one step towards being a prime ideal.

Is it true that f^n in I => f in I?
What if f(x) = x * x^{n/2} ?

-- 
Timothy Murphy  
e-mail (<80k only): tim /at/ birdsnest.maths.tcd.ie
tel: +353-86-2336090, +353-1-2842366
s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland

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