From: Andrej Bauer <andrej.bauer@andrej.com>
To: categories@mta.ca
Subject: Re: regular monos of groups
Date: Sun, 15 Jul 2012 23:27:15 +0200 [thread overview]
Message-ID: <E1Sqfiv-0005eq-FH@mlist.mta.ca> (raw)
In-Reply-To: <E1Si0tQ-0004Zw-Is@mlist.mta.ca>
My blog post has a hole. I am not convinced by Paul's answer on
Mathoverflow (perhaps I just have to work out the details which Paul
left out). So this leaves the question: is every mono in the category
of groups regular, constructively speaking?
With kind regards,
Andrej
On Fri, Jun 22, 2012 at 9:19 AM, Paul Taylor <pt12@paultaylor.eu> wrote:
> Mike Barr said
>
>> Somewhere I have seen a proof that all monics in the category of groups
>> are regular.
>
> Somebody asked this question a while back on MathOverflow
> and I gave the following proof, which is both constructive and
> more explicit than the replies that have been given here.
>
> http://mathoverflow.net/questions/41208/are-all-group-monomorphisms-regular-constructively/46054#46054
>
> Paul Taylor
>
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prev parent reply other threads:[~2012-07-15 21:27 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-21 13:34 Two questions Michael Barr
2012-06-21 17:07 ` Ronnie Brown
2012-06-21 23:32 ` George Janelidze
[not found] ` <E1ShqME-0001Sf-JM@mlist.mta.ca>
2012-06-22 0:25 ` Peter LeFanu Lumsdaine
2012-06-22 7:19 ` regular monos of groups Paul Taylor
2012-07-15 21:27 ` Andrej Bauer [this message]
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