Mysteries of Counting: Euler Characteristic vs. Homotopy Cardinality (2005) [pdf] (math.ucr.edu) 2 points by jdwg 3y ago ↗ HN
[–] jdwg 3y ago ↗ Slides from a talk by John Baez intended for a general technical audience; this was part of a birthday conference for Ross Street.
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