Originally published in DEVELOPMENT OF MATHEMATICS 1950 - 2000, edited by J-P Pier, 715-734, Birkhäuser, Basel, 2000.
MSC 2010: 03G30, 18B25
Keywords: topos, category theory, sheaves
Republished 2014-05-22 in:
Reprints in Theory and Applications of Categories,
No. 24 (2014) pp. 1-22