From: Tom Leinster <tl@maths.gla.ac.uk>
To: categories@mta.ca
Subject: Paper: The Euler characteristic of a category
Date: Tue, 10 Oct 2006 10:36:18 +0100 [thread overview]
Message-ID: <E1GXSPr-0005gj-Uh@mailserv.mta.ca> (raw)
The following paper is available. It is the full version of the talk I
gave at CT06.
"The Euler characteristic of a category"
The Euler characteristic of a finite category is defined and shown to be
compatible with Euler characteristics of other types of object,
including orbifolds. A formula is proved for the cardinality of a
colimit of sets, generalizing the classical inclusion-exclusion formula.
Both rest on a generalization of Mobius-Rota inversion from posets to
categories.
http://arxiv.org/abs/math.CT/0610260
Best wishes,
Tom
--
Tom Leinster <tl@maths.gla.ac.uk>
reply other threads:[~2006-10-10 9:36 UTC|newest]
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