Exact unprovability results for compound well-quasi-ordered combinatorial classesстатья
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Дата последнего поиска статьи во внешних источниках: 6 апреля 2016 г.
Аннотация:In this paper we prove general exact unprovability results that show how a threshold between provability and unprovability of a finite well-quasi-orderedness assertion of a combinatorial class is transformed by the sequence-construction, multiset-construction, cycle-construction and labeled-tree-construction. Provability proofs use the asymptotic pigeonhole principle, unprovability proofs use Weiermann-style compression techniques and results from analytic combinatorics.