Erratum to s7

I made an error in the solution to problem A of homework 7.
The correct formula for t(z) is

   t(z) =  4/ ( bar(z) -1 + i)  + 1 + i

The sign of i in the denominator should be plus.

As a result, t(i) = -3 + i.



This was pointed out to me by Alexandra Bella.
Thank you!