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From: Ronnie Brown <r.brown@bangor.ac.uk>
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Subject: co etc
Date: Mon, 6 Jul 1998 16:07:47 +0100 (BST)
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Re Hilton and Wylie: it really was a landmark in its time, quite readable. 
But the co- contra- change, together with contravariant functors written 
on the right, became contrafusing.  

Ronnie