But f → 1 ± f → 2 {\displaystyle {\vec {f}}_{1}\pm {\vec {f}}_{2}} point into the directions of the asymptotes.
Aber f → 1 ± f → 2 {\displaystyle {\vec {f}}_{1}\pm {\vec {f}}_{2}} sind die Richtungsvektoren der Asymptoten.