To Branch or Not To Branch: Branching and Non-Branching in the Medvedev Lattice of Pi01 Classes, by Christopher P. Alfeld. Most of the content of this thesis is contained in the branching and non-branching papers below.
Classifying the Branching Degrees in the Medvedev Lattice of Pi01 classes, by Christopher Alfeld. Notre Dame Journal of Formal Logic, Volume 49, Issue 3, 2008, pp. 227-243.
Christopher Alfeld >