${\alpha }_1=\frac{X\left({\tau }_1\right)y}{\parallel X\left({\tau }_1\right)\parallel }{\alpha }_{j+1}=\frac{X\left({\alpha }_{j+1}\right)y}{\parallel X\left({\tau }_{j+1}\right)\parallel },{\alpha }_{j+2}=\frac{X\left({\tau }_{j+2}\right)y}{\parallel X\left({\tau }_{j+2}\right)\parallel }$