This article is a reprint of Marta Bunge's 1966 PhD thesis.
Keywords: Presheaf categories
2020 MSC: Primary 18A25
Republished 2024-11-04 in: Reprints in Theory and Applications of Categories, No. 30 (2024) pp. 1-84
http://www.tac.mta.ca/tac/reprints/articles/30/tr30.pdf
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