s
Section 5.7 Matrices
459
Then
a ` b = £
1 0 0
0 1 0
0 0 1
§    a ~ b = £
1 1 0
1 1 1
0 0 1
§
and the Boolean product a × b is
a × b = £
1 1 1
1 1 1
0 0 1
§
■
PRaCtiCe 57 In Example 75, does a × b = a # b?
■
PRaCtiCe 58 In Example 75, compute b × a.