Based on our arguments, in order
to find the optimal t2 and t2 such that Z t2 ¼ 0 and G t2 ¼ 0
respectively, a proper choice of the initial value t2 is very important
due to possible local maxima. Without the right choice of initial value,
for example, taking t2 > ~t2, Newton–Raphson Method fails to produce a solution satisfying the sufficient condition for the maximality
problem of TP(t1, t2)and it will converge to a saddle point