Originally published in:
Diagonal arguments and cartesian closed categories,
Lecture Notes in Mathematics, 92 (1969), 134-145, used by
permission.
2000 MSC: 08-10, 02-00
Republished in:
Reprints in Theory and Applications of Categories,
No. 15 (2006), pp 1-13
http://www.tac.mta.ca/tac/reprints/articles/15/tr15.dvi
http://www.tac.mta.ca/tac/reprints/articles/15/tr15.ps
http://www.tac.mta.ca/tac/reprints/articles/15/tr15.pdf