From: categories <cat-dist@mta.ca>
To: categories <categories@mta.ca>
Subject: Re: functions Omega->Omega
Date: Sat, 12 Jul 1997 14:55:00 -0300 (ADT) [thread overview]
Message-ID: <Pine.OSF.3.90.970712145452.12039A-100000@mailserv.mta.ca> (raw)
Date: Fri, 11 Jul 1997 16:56:25 -0400 (EDT)
From: Andre Scedrov <scedrov@saul.cis.upenn.edu>
> f(a) & a = f(true) & a
>
> I wonder whether anyone has noticed this formula before?
Similar formulas and their analogs in intuitionistic second-order
propositional calculus are discussed in my paper in the Annals Pure
Appl. Logic 27 (1984) 155-164. That paper was motivated by Higgs's
observation that every monic Omega -> Omega in a topos is an involution,
see Peter Johnstone's paper "Automorphisms of Omega" in Alg. Universalis
9 (1979) 1-7.
Andre Scedrov
next reply other threads:[~1997-07-12 17:55 UTC|newest]
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1997-07-12 17:55 categories [this message]
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1997-07-14 23:25 categories
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