| http://www.w3.org/ns/prov#value | - Good open problems are not necessarily easy, and are not too hard either (P?=NP is an open problem in the true sense of the word, but is not particularly useful as a proposal for this kind of forum).A good open problem thus has some intrigue, has some surprise, and should tantalize the reader; the solution should appear to be just over the horizon, rather than indistinctly fading away.
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