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arXiv:0908.1582 [math.MG]AbstractReferencesReviewsResources

On the asymptotic magnitude of subsets of Euclidean space

Tom Leinster, Simon Willerton

Published 2009-08-11, updated 2012-08-06Version 2

Magnitude is a canonical invariant of finite metric spaces which has its origins in category theory; it is analogous to cardinality of finite sets. Here, by approximating certain compact subsets of Euclidean space with finite subsets, the magnitudes of line segments, circles and Cantor sets are defined and calculated. It is observed that asymptotically these satisfy the inclusion-exclusion principle, relating them to intrinsic volumes of polyconvex sets.

Comments: 23 pages. Version 2: updated to reflect more recent work, in particular, the approximation method is now known to calculate (rather than merely define) the magnitude; also minor alterations such as references added
Journal: Geometriae Dedicata, August 2012, 1-24
Categories: math.MG, math.CA, math.CT
Subjects: 18D20, 28A75, 54E35
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