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Feb 9, 2011 at 2:07 comment added user11443 Hi Michael, thanks for your input. The condition in the linked paper actually mentions that each a_i must have at least two non-zero components. I have added that to the question now. But in general, please feel free to assume any reasonable conditions that produce "non-trivial" conditions on f and g.
Feb 8, 2011 at 20:42 history answered Michael Renardy CC BY-SA 2.5