Hi,

If anyone could help me with this I would be very glad! I have said that M=(aij) and M^T=M^-1

therefore if e1 relates v, where v=(x,y,z) then v=(a11,a21,a31) and all of those values can't be simultaneously zero for M^-1 to exist.. can't seem to get any further!

http://img15.imageshack.us/img15/1/unledjs.png