Eight, logarithmic integral
[Definition and other expressions of the number of credit]
It is removed 
and 
the 
in-plane single value resolution.
Where 
is the Euler constant.
[Asymptotic expression for the number of credit]
Where
Eight, logarithmic integral
[Definition and other expressions of the number of credit]
It is removed and the in-plane single value resolution.
Where is the Euler constant.
[Asymptotic expression for the number of credit]
Where
