Tag Archives: Vanishing levels

A new model for all C-sequences are trivial

Joint work with Zhixing You and Jiachen Yuan. Abstract. We construct a model in which all C-sequences are trivial, yet there exists a κ-Souslin tree with full vanishing levels. This answers a question from a previous paper, and provides an … Continue reading

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Walks on uncountable ordinals and non-structure theorems for higher Aronszajn lines

Joint work with Tanmay Inamdar. Abstract. We investigate global structural properties of linear orders of a fixed infinite size. It is classical that the countable linear orders and the continuum-sized orders exhibit contrasting behaviours. Modern results show that strong extensions … Continue reading

Posted in Basis problems, Partition Relations, Work In Progress | Tagged , , , , , , , | 2 Comments

The vanishing levels of a tree

Joint work with Shira Yadai and Zhixing You. Abstract. We initiate the study of the spectrum of sets that can be realized as the vanishing levels V(T) of a normal κ-tree T. This is an invariant in the … Continue reading

Posted in Preprints, Souslin Hypothesis | Tagged , , , , , , , , | 1 Comment

A guessing principle from a Souslin tree, with applications to topology

Joint work with Roy Shalev. Abstract. We introduce a new combinatorial principle which we call AD. This principle asserts the existence of a certain multi-ladder system with guessing and almost-disjointness features, and is shown to be sufficient for carrying out … Continue reading

Posted in Publications, Souslin Hypothesis, Topology | Tagged , , , , , , | 2 Comments