Being Van Kampen is a universal property

Pawel, Sobocinski and Heindel, Tobias (2011) Being Van Kampen is a universal property Logical Methods in Computer Science, 7, (1), pp. 1-22. (doi:10.2168/LMCS-7(1:14)2011).


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Colimits that satisfy the Van Kampen condition have interesting exactness properties. We show that the elementary presentation of the Van Kampen condition is actually a characterisation of a universal property in the associated bicategory of spans. The main theorem states that Van Kampen cocones are precisely those diagrams in a category that induce bicolimit diagrams in its associated bicategory of spans, provided that the category has pullbacks and enough colimits.

Item Type: Article
Digital Object Identifier (DOI): doi:10.2168/LMCS-7(1:14)2011
ePrint ID: 188449
Date :
Date Event
31 March 2011Published
Date Deposited: 25 May 2011 10:04
Last Modified: 18 Apr 2017 02:05
Further Information:Google Scholar

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