content_image/317163.jpg content_image/317164.jpg content_image/317165.jpg content_image/317166.jpg
Finally, we have 

<img src='content_image/317163.jpg'>

where 

As a result, (4.17) yields 

<img src='content_image/317164.jpg'>

<img src='content_image/317165.jpg'>

Now, by using the fact that χ ( y, − T ) = 0 for y ∈ G$_{1}$ by (4.12), we can write 

<img src='content_image/317166.jpg'>

