Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Math Topics » alt.math.undergrad.independent

Topic: Problem from Willard's _General Topology_
Replies: 8   Last Post: Jan 11, 2014 8:54 PM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Michael F. Stemper

Posts: 108
Registered: 9/5/13
Re: Problem from Willard's _General Topology_
Posted: Jan 10, 2014 7:11 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

On 01/10/2014 06:05 PM, Brian M. Scott wrote:
> On Fri, 10 Jan 2014 10:35:43 -0600, "Michael F. Stemper"
> <michael.stemper@gmail.com> wrote in
> <news:lap7hg$2hb$1@dont-email.me> in alt.math.undergrad:


>> And, in general, <x_1, ..., x_n> =
>> { {x_1}, ..., {x_1, ..., x_n} }

>
>> Is this a valid definition of "ordered n-tuple"?
>
> It doesn?t quite work: since
>
> {0, 1, 1} = {0, 0, 1} = {0, 1},
>
> the set {{0}, {0,1}, {0,1}} represents both <0, 1, 0> and
> <0, 1, 1>.


Blast! You're right, of course. Thanks for your help.

--
Michael F. Stemper
Always use apostrophe's and "quotation marks" properly.



Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.