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Jun 4, 2011 at 1:36 comment added yanqing T.kobayashi has constructed an interesting example. arxiv.org/PS_cache/arxiv/pdf/0812/0812.4476v1.pdf
Jun 3, 2011 at 12:15 comment added Sam Nead @yanqing - What I am saying is "your question reduces to a known open problem". So you are unlikely to get a more complete answer than what Ian and I have written.
Jun 3, 2011 at 10:42 comment added yanqing yeah,i hope somebody can give an answer.
Jun 3, 2011 at 10:29 history answered Sam Nead CC BY-SA 3.0