Titlebook: Well-Quasi Orders in Computation, Logic, Language and Reasoning; A Unifying Concept o Peter M. Schuster,Monika Seisenberger,Andreas Weie Bo

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爱国者

Well, Better and In-Between,he equivalence between the two main approaches to defining . and state several essential results of . theory. After recalling the rôle played by the ideals of a . in its .ness, we give a new presentation of known examples of .s which fail to be .. We also provide new forbidden pattern conditions ens

Cirrhosis

清澈

Strong WQO Tree Theorems,ions of Harvey Friedman’s tree theorem (abbr.: FT) on trees whose vertices are labeled by bounded natural numbers are (a) provable in second-order arithmetic .-. (also designated . below) that extends . by transfinite iteration of .-comprehension along arbitrary countable ordinals but (b) not provab

Fretful

一窝小鸟

excursion

Recent Progress on Well-Quasi-ordering Graphs,ful extensions of them have been obtained since Vázsonyi proposed the conjecture about well-quasi-ordering trees by the topological minor relation in the 1940’s. In this article, we survey recent development of well-quasi-ordering on graphs and directed graphs by various graph containment relations,

原始

,The Reverse Mathematics of wqos and bqos,ifferent definitions of the concepts, and basic closure properties) and more advanced theorems. The classification from the reverse mathematics viewpoint of both kinds of results provides interesting challenges, and we cover also recent advances on some long standing open problems.

红肿

COLIC