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University of Canterbury. Mathematics and Statistics.
Doi
Abstract
For all positive integers k, the class Bk of matroids of branch-width
at most k is minor-closed. When k is 1 or 2, the class Bk is, respectively, the
class of direct sums of loops and coloops, and the class of direct sums of series-
parallel networks. B3 is a much richer class as it contains infnite antichains
of matroids and is thus not well-quasi-ordered under the minor order. In this
paper, it is shown that, like B₁ and B₂, the class B₃ can be characterized by
a nite list of excluded minor
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