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* Errata corrige to my previous message
@ 1999-03-19  8:27 Marco Grandis
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From: Marco Grandis @ 1999-03-19  8:27 UTC (permalink / raw)
  To: categories

In my previous reply to F. Lamarche's question, please take off from the
last line of Remark 1:

"   (or cardinals as well)   ".

The site of cardinals  1, 2  also has the non-trivial involution  2 -> 2;
its topos of presheaves is
"INVOLUTIVE reflexive graphs" (which is also of interest in homotopy, of
course).

M. Grandis





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