Originally published as:
Ph.D. thesis, Columbia University, 1963
in Reports of the Midwest Category Seminar II, 1968, 41-61,
© Springer-Verlag, and used by permission.
The authors comments are © F. William Lawvere, 2004.
Keywords: Algebraic theories, functorial semantics
2000 MSC: 18.10
Reprints in Theory and Applications of Categories, No. 5 (2004) pp 1-121
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