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Similarly, we have
Z 1
3
Z 1
1
(
Z 1
) 13 = (
0
.
9333
,
0
.
0167
), (
Z 3
) 31 = (
0
.
8333
,
0
.
0500
)
Z 1
4
Z 1
1
(
Z 1
) 14 = (
0
.
9500
,
0
.
000
), (
Z 4
) 41 = (
0
.
8333
,
0
.
1000
)
Z 1
5
Z 1
1
(
Z 1
) 15 = (
0
.
9000
,
0
.
0500
), (
Z 5
) 51 = (
0
.
8167
,
0
.
1000
)
Z 1
3
Z 1
2
(
Z 2
) 23 = (
0
.
9333
,
0
.
0333
), (
Z 3
) 32 = (
0
.
9167
,
0
.
0333
)
Z 1
4
Z 1
2
(
Z 2
) 24 = (
0
.
9167
,
0
.
0167
), (
Z 4
) 42 = (
0
.
8833
,
0
.
0500
)
Z 1
5
Z 1
2
(
Z 2
) 25 = (
0
.
9000
,
0
.
0333
), (
Z 5
) 52 = (
0
.
9000
,
0
.
0500
)
Z 1
4
Z 1
3
(
Z 3
) 34 = (
0
.
8667
,
0
.
0000
), (
Z 4
) 43 = (
0
.
8333
,
0
.
0500
)
Z 1
5
Z 1
3
(
Z 3
) 35 = (
0
.
8667
,
0
.
0833
), (
Z 5
) 53 = (
0
.
8500
,
0
.
0667
)
Z 1
5
Z 1
4
(
Z 4
) 45 = (
0
.
8167
,
0
.
1000
), (
Z 5
) 54 = (
0
.
8833
,
0
.
0833
)
According to Xu and Yager (2006)'s ranking method, we know that
Z 1
2
Z 1
1
Z 1
3
Z 1
1
(
Z 1
) 12 >(
Z 2
) 21 ,(
Z 1
) 13 >(
Z 3
) 31
Z 1
4
Z 1
1
Z 1
5
Z 1
1
(
Z 1
) 14 >(
Z 4
) 41 ,(
Z 1
) 15 >(
Z 5
) 51
Z 1
3
Z 1
2
Z 1
4
Z 1
2
(
Z 2
) 23 >(
Z 3
) 32 ,(
Z 2
) 24 >(
Z 4
) 42
Z 1
5
Z 1
2
Z 1
4
Z 1
3
(
Z 2
) 25 >(
Z 5
) 52 ,(
Z 3
) 34 >(
Z 4
) 43
Z 1
5
Z 1
3
Z 1
5
Z 1
4
(
Z 3
) 35 >(
Z 5
) 53 ,(
Z 4
) 45 <(
Z 5
) 54
from which we get y 4
y 1 .
From the above process, we can see that the intuitionistic fuzzy triangle product
can be used to compare the alternatives in multi-attribute decision making with
intuitionistic fuzzy information, but the computational complexity increases rapidly
as the numbers of the alternatives and attributes increase.
y 5
y 3
y 2
2.9.4 The Application of the Intuitionistic Fuzzy Square Product
From Eq. ( 2.204 ), we know that the intuitionistic fuzzy square product
Z 2 ) ij
can be interpreted as: it measures the similarity degree of the i th row of an intu-
itionistic fuzzy matrix Z 1 and the j th row of an intuitionistic fuzzy matrix R 2 mathe-
matically. Therefore, considering the problem stated at the beginning of Sect. 2.9.2 ,
(
(
Z 1
Z j ) ij reflects the similarity of the alternatives y i and y j . We can use the follow-
ing formula to construct an intuitionistic fuzzy similarity matrix for the alternatives
y i (
Z i
i
=
1
,
2
,...,
n
)
:
 
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