Hello,
Could you please help on proving the following:
If s,r are vectors and they are perpendicular; then, if r= (x,y) then s=(-y,x)
(These are supposed to be column vectors but couldn't find it here.
I think it has to do with their gradients.
(Where y1/x1 * y2/x2 = -1)
How to proceed or any idea to prove ?
