We need to show that if rpi is a reflection in a plane pi, then the composition rpi of rpi=id using only the algebraic description of rpi without using the geometric definition of reflection at all. I'm very lost. Any ideas?
We need to show that if rpi is a reflection in a plane pi, then the composition rpi of rpi=id using only the algebraic description of rpi without using the geometric definition of reflection at all. I'm very lost. Any ideas?