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From: "Eduardo J. Dubuc" <edubuc@dm.uba.ar>
To: Clemens Berger <Clemens.BERGER@univ-cotedazur.fr>,
	Pedro Resende <pedro.m.a.resende@tecnico.ulisboa.pt>
Cc: Steven Vickers <s.j.vickers.1@bham.ac.uk>,
	categories list <categories@mta.ca>
Subject: categories: Re: complete Galois groups
Date: Mon, 30 Jan 2023 14:34:33 -0300	[thread overview]
Message-ID: <E1pMaXE-000649-2N@rr.mta.ca> (raw)
In-Reply-To: <E1pMEQM-0001J4-7j@rr.mta.ca>


On 28/01/2023 07:48, Clemens Berger wrote:
> How can we characterise ``intrinsically'' toposes that are of the
> form BG for a complete Galois group G

   An observation that I do not know if of any help:

What you want is how to characterize a pointed atomic (i.e. connected,
locally connected, Boolean) topos p: G ---> Ens such that the morphism
lAut(p) ---> Aut(p) is an isomorphism (where lAut is the localic group
of automorphism).

(recall that this localic group is explicitely constructed in my article
"Localic Galois Theory")

all the best  Eduardo


[For admin and other information see: http://www.mta.ca/~cat-dist/ ]

  reply	other threads:[~2023-01-30 20:14 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-16 11:50 Terminology for point-free topology? Steven Vickers
     [not found] ` <a23cbfc0-7433-eec1-115e-af2041d4cfd1@uu.nl>
2023-01-18 12:12   ` Steven Vickers
2023-01-20  3:06     ` David Yetter
     [not found]     ` <SN6PR05MB5213EBE225CB83D101EA0F57A2C59@SN6PR05MB5213.namprd05.prod.outlook.com>
2023-01-20 11:50       ` Steven Vickers
2023-01-21 19:42         ` ptj
2023-01-23 11:44           ` Pedro Resende
2023-01-30 21:59             ` categories: " Wesley Phoa
2023-02-01  9:41               ` Martin Hyland
     [not found]     ` <18E1AA5F-0054-4CA3-B231-BD9B799B03A2@tecnico.ulisboa.pt>
2023-01-23 13:47       ` Steven Vickers
     [not found]     ` <YQXPR01MB26464DF33EAE7481847A4F82E5C99@YQXPR01MB2646.CANPRD01.PROD.OUTLOOK.COM>
2023-01-24 12:20       ` categories: " Robert Pare
2023-01-27 17:55     ` Pedro Resende
2023-01-28  5:43       ` Patrik Eklund
2023-01-29 23:16         ` dawson
2023-01-28 10:48       ` categories: complete Galois groups Clemens Berger
2023-01-30 17:34         ` Eduardo J. Dubuc [this message]
     [not found] ` <LNXP265MB1049E00AEC9CE5BE1233CCEF95C69@LNXP265MB1049.GBRP265.PROD.OUTLOOK.COM>
2023-01-22 21:32   ` Terminology for point-free topology? Vaughan Pratt
     [not found] ` <CAL7kZqCz081nyFQuo_QFfaGzGe+UBORJHOZWsO9VgNzpDJ9_Gw@mail.gmail.com>
2023-01-23 13:25   ` Steven Vickers
     [not found] ` <LNXP265MB104912A7940157738582CE2595C89@LNXP265MB1049.GBRP265.PROD.OUTLOOK.COM>
2023-01-23 23:17   ` categories: " Vaughan Pratt
     [not found] ` <CAL7kZqAPzmzf=wt=qKNBjjeb_dGtG4eDu7tv5Eku-AVZD7wWtw@mail.gmail.com>
2023-01-24 11:45   ` Steven Vickers

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