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Apr 13, 2010 at 17:52 vote accept Tobias Kildetoft
Apr 13, 2010 at 17:34 comment added Jack Schmidt It is Theorem C, page 303: dl(G) = dl(G')+1, cd(G) = cd(G|G')+1, and theorem C says that if cd(G|G')=3, then dl(G')≤3. This is stated twice on that page, but not in italics.
Apr 13, 2010 at 16:49 comment added Tobias Kildetoft I looked through the first article, but none of the theorems in that is the one I mentioned.
Apr 13, 2010 at 15:41 history answered Jack Schmidt CC BY-SA 2.5