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Jan 6, 2016 at 17:45 comment added Igor Rivin @joro since there are squares involved, the variables can be assumed to be non-negative. If some of them are zero, we have a problem with a smaller number of variables. No?
Jan 6, 2016 at 15:00 comment added joro The OP wants them positive, does yours still apply?
Jan 6, 2016 at 14:15 history edited Igor Rivin CC BY-SA 3.0
fixed typos
Jan 6, 2016 at 14:10 history answered Igor Rivin CC BY-SA 3.0