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Oct 8, 2010 at 12:17 comment added Vagabond Edited the question, specifying the condition that none of the minors are singular. Thanks for pointing out.
Oct 8, 2010 at 11:58 comment added Vagabond The requirement is none of the sub matrices are singular, I guess I have not been able to specify it clearly.
Oct 8, 2010 at 11:49 history answered Gerry Myerson CC BY-SA 2.5