2013 | OriginalPaper | Chapter
Certified Kruskal’s Tree Theorem
Author : Christian Sternagel
Published in: Certified Programs and Proofs
Publisher: Springer International Publishing
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This paper gives the first formalization of Kruskal’s tree theorem in a proof assistant. More concretely, an Isabelle/HOL development of Nash-Williams’ minimal bad sequence argument for proving the tree theorem is presented. Along the way, the proofs of Dickson’s lemma and Higman’s lemma are discussed.