Die Matrix M {\displaystyle {}M} bildet
ab. Wir setzen u 1 := e 4 {\displaystyle {}u_{1}:=e_{4}} , u 2 := e 1 {\displaystyle {}u_{2}:=e_{1}} , u 3 := e 2 {\displaystyle {}u_{3}:=e_{2}} , u 4 := e 3 {\displaystyle {}u_{4}:=e_{3}} .