This article is a reprint of a 1997 thesis for a PhD degree at the University of New York at Buffalo.
Keywords: Topos Theory, Combinatorial Topology
2020 MSC: Primary 18B25; Secondary 18F10, 55U10
Republished 2021-03-29 in:
Reprints in Theoy and Applications of Categories, No. 28 (2021) pp. 1-63
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