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From: "David Espinosa" <david@davidespinosa.net>
To: <categories@mta.ca>
Subject: Re: Grothendieck construction
Date: Fri, 19 Jan 2007 10:44:48 -0800	[thread overview]
Message-ID: <E1H83Hw-0002I0-3S@mailserv.mta.ca> (raw)


> "he knew it long before Grothendieck..."

So maybe the construction itself is obvious, particularly if you know the
semi-direct product or some other specialization (of the general
construction).

But the intrinic characterization of what the construction yields, that is,
the definition of a fibration, seems less obvious.

I'm sure everyone has a favorite example of that.  For example, Carsten
Fuhrmann gave an intrinsic description of the Kleisli category of a monad
only in 1999.  His home page is:

  http://www.cs.bath.ac.uk/~cf/

David








             reply	other threads:[~2007-01-19 18:44 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-19 18:44 David Espinosa [this message]
  -- strict thread matches above, loose matches on Subject: below --
2017-03-13 21:40 Grothendieck Construction Joseph Moeller
2007-01-18 19:50 Grothendieck construction I. Moerdijk
2007-01-17  8:47 Artur Zawlocki
2007-01-17  1:23 wlawvere
2007-01-16 14:17 Gaucher Philippe

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