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Education > Math Undergrad > Re: topology
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Re: topology

by Paul Sperry <plsperry@[EMAIL PROTECTED] > May 3, 2008 at 04:34 AM

[Quotes added]

In article
<26641995.1209783286823.JavaMail.jakarta@[EMAIL PROTECTED]
>, amu
<amu786la@[EMAIL PROTECTED]
> wrote:

>In article <020520082220496207%plsperry@[EMAIL PROTECTED]
>, Paul Sperry
<plsperry@[EMAIL PROTECTED]
> wrote:
>
>> In article
>> <12420190.1209774828799.JavaMail.jakarta@[EMAIL PROTECTED]
>, amu
>> <amu786la@[EMAIL PROTECTED]
> wrote:
>> 
>> > Let X,Y be topological spaces. Consider Z = X x Y and the product
topology
>> > genearted by the projections p_x, p_y. Let A be a subset of Z. 
>> > Suppose that X,Y are locally path connected. Show that A is
connected if and
>> > only if A is path connected.
>> 
>> Consider A = { (x, sin(1/x)} : x in R - {0} ) \/ { (0, 0) }.
>> 
>> A is a standard example of a subset of R x R which is connected but
not
>> path-connected. R is, of course, path-connected.

I meant to write that R is locally path-connected.

> i know this example but don't know how to write the proof

The example says your conjecture is wrong: X and Y are locally
path-connected, A is connected but is not path-connected. [Of course
any path-connected set is connected.]

What is it that you can't prove?

[If you reply (feel free) please be sure to quote this post so people
will know what you are talking about.]

-- 
Paul Sperry
Columbia, SC (USA)
 




 14 Posts in Topic:
topology
amu <amu786la@[EMAIL P  2008-05-02 20:33:18 
Re: topology
Paul Sperry <plsperry@  2008-05-03 02:20:50 
Re: topology
amu <amu786la@[EMAIL P  2008-05-02 22:54:16 
Re: topology
Paul Sperry <plsperry@  2008-05-03 04:34:09 
Re: topology
amu <amu786la@[EMAIL P  2008-05-03 23:41:53 
Re: topology
amu <amu786la@[EMAIL P  2008-05-03 23:39:27 
Re: topology
Virgil <Virgil@[EMAIL   2008-05-03 23:09:28 
topology
William Elliot <marsh@  2008-05-04 01:05:58 
Re: topology
amu <amu786la@[EMAIL P  2008-05-04 15:18:22 
Re: topology
Virgil <Virgil@[EMAIL   2008-05-04 13:32:48 
Re: topology
William Elliot <marsh@  2008-05-04 22:46:09 
Re: topology
amu <amu786la@[EMAIL P  2008-05-04 19:30:27 
Re: topology
William Elliot <marsh@  2008-05-05 01:33:43 
Re: topology
William Elliot <marsh@  2008-05-05 01:34:51 

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