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Walks on ordinals. See the lecture notesPropositions 4 & 5 from: http://www.math.cmu.edu/~eschimme/Appalachian/Todorcevic.htmlhere.
Walks on ordinals. See the lecture notes from: http://www.math.cmu.edu/~eschimme/Appalachian/Todorcevic.html
Walks on ordinals. See Propositions 4 & 5 from here.
