From: Tom Goodwillie <tomg@math.brown.edu>
Subject: correction
Date: Tue, 6 Feb 2001 20:49:07 +0000

Sorry, there was a typo in my message about suspensions.
I said that the intersection of U and V
is (weakly) equivalent to the unreduced suspension of
CX; I meant to say the unreduced suspension of X itself.

So (if I got this right), the reduced suspension of the
(contractible but not necessarily in the based sense) based space CX is
in general weakly equivalent to the homotopy cofiber of the
canonical map from the unreduced suspension  of X to the
reduced suspension of X (for any based space X).

Tom Goodwillie