By Ian Anderson
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Extra resources for Combinatorics of finite sets
E. if P is connected, d ( P ) > 1 and a ( P ) = 2 d ‘ P ’ + ’ - 2 . If Q is a connected minor of a connected matroid perspective P there exists a sequence of connected matroid perspectives Po = P, P 1 ,. . ,Pk = Q such that Pi+1 is obtained from Pi by deleting or contracting one element for i = 0, 1, . . 81). 5. Any connected minor of degree >1 of an a-minimal matroid perspective is also a-minimal. 5 there is a characterization by excluded minors of a-minimal matroid perspectives. The list of excluded minors is infinite: for all n 3 3 (ff :-I, ‘5L) is not a-minimal but every proper minor is.
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Combinatorics of finite sets by Ian Anderson