From: Peter McBurney <p.j.mcburney@csc.liv.ac.uk>
To: CATEGORIES LIST <categories@mta.ca>
Subject: Generalization of Browder's F.P. Theorem?
Date: Wed, 15 Jan 2003 14:00:32 +0000 [thread overview]
Message-ID: <3E256980.AEFD39A1@csc.liv.ac.uk> (raw)
Hello --
Does anyone know of a generalization of Browder's Fixed Point Theorem
from R^n to arbitrary topological spaces, or to categories of same?
*****************
Theorem (Browder, 1960): Suppose that S is a non-empty, compact, convex
subset of R^n, and let
f: [0,1] x S --> S
be a continuous function. Then the set of fixed points
{ (x,s) | s = f(x,s), x \in [0,1] and s \in S }
contains a connected subset A such that the intersection of A with {0} x
S is non-empty and the intersection of A with {1} x S is non-empty.
*****************
Many thanks,
-- Peter McBurney
University of Liverpool, UK
next reply other threads:[~2003-01-15 14:00 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-15 14:00 Peter McBurney [this message]
2003-01-16 14:04 ` Steven J Vickers
2003-01-16 23:00 ` Prof. Peter Johnstone
2003-01-16 23:05 ` Michael Barr
2003-01-21 18:11 ` Andrej Bauer
2003-01-22 10:13 ` Cauchy completeness of Cauchy reals Martin Escardo
2003-01-22 23:33 ` Dusko Pavlovic
2003-01-23 19:56 ` Category Theory in Biology Peter McBurney
2003-01-24 8:51 ` Cauchy completeness of Cauchy reals Martin Escardo
2003-01-25 2:21 ` Dusko Pavlovic
2003-01-25 16:24 ` Prof. Peter Johnstone
2003-01-27 3:57 ` Alex Simpson
2003-01-23 6:29 ` Vaughan Pratt
2003-02-04 0:47 ` Vaughan Pratt
2003-02-05 16:06 ` Prof. Peter Johnstone
2003-01-23 9:50 ` Mamuka Jibladze
2003-01-24 1:34 ` Ross Street
2003-01-24 16:56 ` Dusko Pavlovic
2003-01-24 19:48 ` Dusko Pavlovic
2003-01-17 16:19 Generalization of Browder's F.P. Theorem? Carl Futia
2003-01-18 12:39 ` S Vickers
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=3E256980.AEFD39A1@csc.liv.ac.uk \
--to=p.j.mcburney@csc.liv.ac.uk \
--cc=categories@mta.ca \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).