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Twin trees II: Local structure and a universal construction

par Ronan, Mark A.;Tits, Jacques
Référence Israel Journal of Mathematics, 109, 1, page (349-377)
Publication Publié, 1999-12

Article révisé par les pairs

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Résumé :

We investigate the local structure of twin tress, and produce for any semihomogeneous treeT a “universal twin” that contains, in a natural way, all trees twinned withT. Our methods allow us to show that there are uncountably many isomorphism classes of twinnings involving any semihomogeneous tree.