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Mar 27, 2014 at 19:50 comment added Mirko @Ramiro I added a sketch of the proof.
Mar 27, 2014 at 19:48 history edited Mirko CC BY-SA 3.0
added sketch of proof
Mar 27, 2014 at 19:42 history edited Mirko CC BY-SA 3.0
added sketch of proof
Mar 27, 2014 at 18:32 comment added Ramiro de la Vega The fact is mentioned without proof in Nyikos´ paper. He says it is "easy to show"; is it?
Mar 27, 2014 at 15:24 history answered Mirko CC BY-SA 3.0