public static KVector2 operator *(double k, KVector2 v) { return(KVector2.Multiply(k, v)); }
public static KVector2 operator /(KVector2 v, double k) { return(KVector2.Multiply(v, 1 / k)); }
public static KVector2 operator -(KVector2 u) { return(KVector2.Multiply(-1, u)); }