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wheel -- wheels/whirls

Synopsis

Description

The families of wheels and whirls appears in Oxley, p. 659-660. The rank-r wheel is the graphic matroid of the wheel graph with r outer vertices, and has 2r elements. The rank-r whirl is the unique relaxation of the rank-r wheel (and thus also has 2r elements).

i1 : M = wheel 3

o1 = a "matroid" of rank 3 on 6 elements

o1 : Matroid
 
i2 : M == matroid wheelGraph 4

o2 = true
 
i3 : N = whirl 3

o3 = a "matroid" of rank 3 on 6 elements

o3 : Matroid
 
i4 : areIsomorphic(N, relaxation M)

o4 = true

See also

Ways to use wheel :

For the programmer

The object wheel is a method function.