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Nov 29, 2010 at 19:50 comment added user11175 Hi all, I haven't understand all your answers. But I will look into them. Thank you so much for your replies. And just to clarify, $x_1$ and $x_2$ are vectors.
Nov 23, 2010 at 23:16 answer added F_G timeline score: 1
Nov 23, 2010 at 9:11 answer added Suvrit timeline score: 0
Nov 23, 2010 at 8:49 answer added robin girard timeline score: 0
Nov 23, 2010 at 2:07 answer added Mike Spivey timeline score: 0
Nov 23, 2010 at 1:16 comment added J. M. isn't a mathematician $x_1$ and $x_2$ are vectors?
Nov 23, 2010 at 0:22 history asked Kenny CC BY-SA 2.5