I think I'm pretty close to getting this but can't quite figure out what do next!
From earlier in the question...
(*)
Show that erf(x) can be expressed in terms of the incomplete gamma function, and that the above asymptotic expansion agrees with the result obtained in Problem 6. [The formula (**) for integer n may be useful.]
So I think I have to show the relation... (***) as that's the relation I've seen elsewhere.
The result obtained in question 6 was...
And also...
Right so intro done!
Now what I've done...
From (*)
(This step seems to be showing that which corresponds to (***))
Using (**)
But I'm stuck now. I don't even know if what I've done so far is right to be honest... Any help please!