Exercise Set 7.1
2.
(a)
Since 
with equality
if and only if 
for all i, properties (i) and (ii)
in Definition 7.1 hold.
Also,
so property (iii) holds.
Finally,
so property (iv) holds.
4.
(c) 4 (d) 12
6.
(c) 4 (d) 12
10.
Using the Cauchy-Buniakowsky-Schwarz (CBS) inequality gives
Thus, 
Exercise Set 7.3
1.
(f)
The kth iterates of the Jacobi method are
The first two iterates are
2.
(f)
The kth iterates of the Gauss-Seidel method are
The first two iterates are
6.
(f)
The kth iterates of the SOR method are:
With 
and 
the first two iterates are:
