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Being Van Kampen is a universal property

Pawel Sobocinski ; Tobias Heindel.
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&nbsp;[&hellip;]
Published on April 1, 2011
Volume 7, Issue 1
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