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From: Vaughan Pratt <pratt@cs.stanford.edu>
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Subject: Undirected graphs citation
Date: Mon, 27 Feb 2006 09:23:50 -0800
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What would be an early reference for the representation of undirected
graphs (of the set-enriched rather than {0,1}-enriched kind) as
presheaves on the full subcategory 1 and 2 of Set?

Vaughan Pratt