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Oct 26, 2012 at 2:04 vote accept Mohammad Farajzadeh-Tehrani
Oct 25, 2012 at 16:36 answer added Mark Gross timeline score: 11
Oct 25, 2012 at 13:25 comment added Charles Staats It seems to me that the paper referenced by roy smith is precisely intended to address your question. The length of the paper suggests that the author did not find any simple necessary and sufficient conditions of the sort you seem to be looking for. Since the paper was written in 1983, there may be additional progress since then. However, this at least shows that the problem is, in fact, studied in the literature.
Oct 25, 2012 at 2:54 comment added Mohammad Farajzadeh-Tehrani No, thanks. I will see if it has any answer for this question. Meanwhile I will appreciate if someone can give a concrete answer.
Oct 25, 2012 at 2:27 comment added roy smith have you read thius? jstor.org/discover/10.2307/…
Oct 25, 2012 at 0:22 history asked Mohammad Farajzadeh-Tehrani CC BY-SA 3.0