Publication Type:
Journal ArticleSource:
Cahiers Topologie Géom. Différentielle Catég., Volume 32, p.29–46 (1991)URL:
https://eudml.org/doc/91469Notes:
<p>International Category Theory Meeting (Bangor, 1989 and Cambridge, 1990)<br />
<br />
Warning: the main theorem of this paper was shown by Carlos Simpson to be false. </p>
<p> </p>