Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4650833 | Discrete Mathematics | 2007 | 6 Pages |
Abstract
Let I be any topological minor closed class of trees (a tree ideal). A classical theorem of Kruskal [Well-quasi-ordering, the Tree Theorem, and Vazsonyi's conjecture, Trans. Am. Math. Soc. 95 (1960) 210-223] states that the set O(I) of minimal non-members of I is finite. On the other hand, a finite structural description S(I) is developed by Robertson, et al. [Structural descriptions of lower ideals of trees, Contemp. Math. 147 (1993) 525-538]. Given either of the two finite characterizations of I, we present an algorithm that computes the other.
Keywords
Related Topics
Physical Sciences and Engineering
Mathematics
Discrete Mathematics and Combinatorics
Authors
Yared Nigussie,