From: Sjoerd CRANS <crans@math.mcgill.ca>
To: categories@mta.ca
Subject: Re: computation in CPS
Date: Mon, 9 Nov 1998 16:31:58 -0500 (EST) [thread overview]
Message-ID: <199811092131.QAA18657@scylla.math.mcgill.ca> (raw)
Philippe Gaucher <gaucher@irma.u-strasbg.fr> asked:
> for a CPS, is there a way to compute
> the source and target of a R({x}) using only compositions of elements
> like R({y}) ?
Yes and no.
Yes in the sense that because the source and the target are pasting
schemes themselves, Johnson's pasting theorem gives that 1. they
are compositions of R({y})'s and 2. *any* way you do this gives the
same result.
No in two senses: although Johnson's proof actually gives an algorithm,
I don't think this algorithm has ever been implemented (in AXIOM for
example); and secondly, there is (as far as I know) no *general*
expression which works for cubes of all dimensions.
Sjoerd Crans
next reply other threads:[~1998-11-09 21:31 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-11-09 21:31 Sjoerd CRANS [this message]
-- strict thread matches above, loose matches on Subject: below --
1998-11-11 22:21 Ross Street
1998-11-09 10:06 Philippe Gaucher
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