Sat, 07 May 2011 09:40:20 -0700 Kevin Walker string diagrams have stratifications more general than mere cell complexes
Sat, 07 May 2011 09:27:21 -0700 Kevin Walker minor
Sat, 07 May 2011 09:18:37 -0700 Kevin Walker added remark about defect categories; tweaked sphere cat intro
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