I have to prove if a,b,c <> 0 and

then is

Help someone?

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- January 24th 2006, 01:30 PMDenMac21Help to prove
I have to prove if a,b,c <> 0 and

then is

Help someone? - January 24th 2006, 11:14 PMrgep
Write the common value and treat it as a system of three linear equations in four unknowns x,y,z,t. Note that the rank of the system is three, since the determinant of the 3-by-3 minor corresponding to x,y,z is 2abc: hence there is a one-dimensional family of solutions. Since x=a, y=b, z=c, t=0 is clearly a solution, all solutions are multiples of this.

- January 25th 2006, 02:57 AMDenMac21Quote:

Originally Posted by**rgep**

I didn't quite understand it.