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when toggle format what by license comment
Nov 8, 2013 at 0:08 comment added user40096 Yes,I should have updated my question.It is my negligence.
Nov 4, 2013 at 16:03 comment added domotorp I see, maybe next time it is a good idea to update your question/put a link to the next question you pose. So what is the question left here?
Nov 4, 2013 at 13:37 comment added user40096 Thank you for your answer,domotorp.The simplest case had been answered by Tony Huynh,see my another question:mathoverflow.net/questions/145531/….
Nov 2, 2013 at 20:52 history answered domotorp CC BY-SA 3.0