From: "Bill Halchin" <bhalchin@hotmail.com>
To: categories@mta.ca
Subject: co-exponential question
Date: Fri, 16 Jul 1999 12:55:48 PDT [thread overview]
Message-ID: <19990716195548.73188.qmail@hotmail.com> (raw)
This is actually a "dual" question.
Basically I want to do the dual of the construction
gives the notion of an exponential or map object.
Suppose we have a category C with sums. Then we build the
following category from C.
object: T+X<-----Y
map: from T+X<-----Y to T+X'<-------Y is a C map "alpha" such
that we have the following diagram:
I-sub-T+alpha
T+X---------------------------->T+X'
^ ^
\ /
\ /
\ /
\ /
\ /
\ /
\ /
\ /
\ /
\ /
\ /
\ /
\ /
\ /
\/
Y
Then suppose there exists a C-object called Y**T such
that T+Y**T<-------Y is the initial object of the category
just built above. What significance does Y**T have opposed
to the concept of an exponential???? If I did everything
correctly it (Y**T) should be the dual of T**Y.
Regards,
Bill Halchin
next reply other threads:[~1999-07-16 19:55 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-07-16 19:55 Bill Halchin [this message]
1999-07-20 20:57 ` William James
1999-07-20 17:41 ` Paul Levy
1999-07-22 20:28 Andrzej Filinski
1999-07-23 19:40 ` Peter Selinger
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