From: "Clemens.BERGER" <cberger@math.unice.fr>
To: categories@mta.ca
Subject: Re: name for a concept
Date: Thu, 08 Dec 2005 12:26:08 +0100 [thread overview]
Message-ID: <43981850.2080902@math.unice.fr> (raw)
In my previous message, one should read:
a commutative square with two parallel fibrations in a right proper
model category is a homotopy pullback if and only if the square is exact
with respect to the class of weak equivalences. These special squares
compose because weak equivalences are stable under base change along
fibrations (this is the definition of right proper).
Clemens Berger.
next reply other threads:[~2005-12-08 11:26 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-08 11:26 Clemens.BERGER [this message]
-- strict thread matches above, loose matches on Subject: below --
2005-12-08 11:06 Clemens.BERGER
2005-12-07 13:36 Name " Peter Freyd
2005-12-06 10:12 jean benabou
2005-12-07 0:58 ` Toby Bartels
2005-12-07 19:15 ` Eduardo Dubuc
2005-12-05 14:44 Marco Grandis
2005-12-01 1:48 Michael Barr
2005-12-02 11:19 ` Ronald Brown
2005-12-02 13:51 ` Marco Grandis
2005-12-05 16:16 ` Eduardo Dubuc
2005-12-07 11:04 ` Marco Grandis
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