Corollary 7.17.
Assuming that:
U
,
V
are independent random variables
(
U
,
V
)
is
C
-relevant
to
(
X
,
Y
)
Then
(i)
(
U
1
|
U
1
+
U
2
,
V
1
|
V
1
+
V
2
)
is
2
C
-relevant
to
(
X
,
Y
)
.
(ii)
(
U
1
|
U
1
+
V
1
,
U
2
|
U
2
+
V
2
)
is
2
(
C
+
1
)
-relevant
to
(
X
,
Y
)
.