From: "Fred E.J. Linton" <fejlinton@usa.net>
To: "categories" <categories@mta.ca>
Subject: Terminological question, and more
Date: Wed, 03 Nov 2010 17:40:46 -0400 [thread overview]
Message-ID: <E1PEC12-0002PJ-DL@mlist.mta.ca> (raw)
I've been asked for "... the name given in an arbitrary category
to an object A for which every mono B----->A is an isomorphism."
I'm stumped. Any ideas?
I've also been asked to comment on whether "the inclusion Q >-------> R of
the ring of rational numbers into that of real ones is a bimorphism, in the
category Rng of rings with units and units preserving ring homomorphisms."
Reflexively I think: monic, yes; epic, no, as permuting any two independent
transcendentals should extend to a non-identity automorphism of R over Q.
Am I missing something here?
TIA; and cheers, -- Fred
[For admin and other information see: http://www.mta.ca/~cat-dist/ ]
next reply other threads:[~2010-11-03 21:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-03 21:40 Fred E.J. Linton [this message]
2010-11-05 9:55 ` Prof. Peter Johnstone
2010-11-05 11:52 ` George Janelidze
2010-11-05 12:51 ` Michael Barr
2010-11-05 23:12 Fred E.J. Linton
2010-11-10 1:23 Fred E.J. Linton
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