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Mar 16, 2012 at 8:32 vote accept Marc Palm
Mar 16, 2012 at 7:50 answer added Amritanshu Prasad timeline score: 1
Mar 15, 2012 at 18:12 answer added Guntram timeline score: 1
Mar 15, 2012 at 17:45 comment added Marc Palm For the motivation, you can have a look at section 6.2.6 in Abramenko-Brown "Buildings" or chapter 5 in Garrett "Buildings", where the decisive properties of a BN pair are described.
Mar 15, 2012 at 17:40 history edited Marc Palm CC BY-SA 3.0
some spelling and phrasing improved, I hope
Mar 15, 2012 at 16:28 history edited Marc Palm CC BY-SA 3.0
added 317 characters in body; added 7 characters in body; added 1 characters in body
Mar 15, 2012 at 16:18 history asked Marc Palm CC BY-SA 3.0