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Oct 12, 2014 at 13:41 vote accept mohi
Oct 12, 2014 at 10:15 history edited Alexey Ustinov CC BY-SA 3.0
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Oct 12, 2014 at 8:28 history edited Alexey Ustinov CC BY-SA 3.0
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Oct 12, 2014 at 8:24 comment added Alexey Ustinov If you need a parametrization only then you can change variables $v\to -v$, $z\to -z$. If you need more then you can use Rogovskaya's observations.
Oct 12, 2014 at 5:41 comment added mohi $a_1+a_2+a_3=0$ would be correct if $x+y+z=u+v+w$ here we have $x+y+v=u+w+z$
Oct 12, 2014 at 5:37 comment added mohi Here $a_1+b_2=b_3$
Oct 12, 2014 at 5:33 comment added Alexey Ustinov $a_1+a_2+a_3=0$ is the second (linear) equation of the given system.
Oct 12, 2014 at 5:29 comment added mohi Thanks but I'm not sure I agree with the parameterization. Please note that $a_1+a_2+a_3\neq 0$ as here $x+y+v=u+w+z$
Oct 12, 2014 at 3:38 history edited Alexey Ustinov CC BY-SA 3.0
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Oct 12, 2014 at 3:30 history edited Alexey Ustinov CC BY-SA 3.0
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Oct 12, 2014 at 3:24 history answered Alexey Ustinov CC BY-SA 3.0