Bell Number Diagrams
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The Bell number is the number of ways to partition a set of elements into disjoint, nonempty subsets. In this Demonstration, points are at the corners of a regular -gon. Members of the same subset are connected with line segments (singletons appear as dots).
Contributed by: Robert Dickau (March 2011)
Open content licensed under CC BY-NC-SA
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"Bell Number Diagrams"
http://demonstrations.wolfram.com/BellNumberDiagrams/
Wolfram Demonstrations Project
Published: March 7 2011