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 » sci.math.* » sci.math

Topic: Simple analytical properties of n/d
Replies: 20   Last Post: Mar 11, 2013 11:01 PM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Shmuel (Seymour J.) Metz

Posts: 3,473
Registered: 12/4/04
Re: Simple analytical properties of n/d
Posted: Mar 10, 2013 10:29 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

In <Pine.NEB.4.64.1303070027340.14344@panix3.panix.com>, on 03/07/2013
at 12:38 AM, William Elliot <marsh@panix.com> said:

>What's a pointed disk?

(D,d), where d \in interior D[1].

>R^2\(0,0) is neither a disk nor pointed; it's a punctured plain.

ITYM punctured plane; it's homeomorphic to a punctured disk.

>No. The image of f is R.

What's f^{-1}(0)?

[1] The definition works for both open and closed disks.

Shmuel (Seymour J.) Metz, SysProg and JOAT <http://patriot.net/~shmuel>

Unsolicited bulk E-mail subject to legal action. I reserve the
right to publicly post or ridicule any abusive E-mail. Reply to
domain Patriot dot net user shmuel+news to contact me. Do not
reply to spamtrap@library.lspace.org

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

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2015. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.