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Mar 19, 2017 at 4:59 answer added Kevin P. Costello timeline score: 2
Mar 19, 2017 at 4:20 answer added Gerhard Paseman timeline score: 0
Mar 18, 2017 at 15:27 comment added lchen @GerhardPaseman Thank you Gerhard. Langford sequences actually are much stronger than the sequences I am looking for. I want to know what we can obtain by relaxing the constraint in Langford sequences.
Mar 18, 2017 at 14:57 comment added Gerhard Paseman Consider studying Langford and Skolem sequences. mathoverflow.net/a/71104 has some suggestions. Gerhard "Also Do A Web Search" Paseman, 2017.03.18.
Mar 18, 2017 at 12:33 history asked lchen CC BY-SA 3.0