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Problem
#WSP-000490
Problems
Graph theory
12–16
4.0
Problem
Using
R
(
s
,
t
)
≤
R
(
s
−
1
,
t
)
+
R
(
s
,
t
−
1
)
, prove that
R
(
k
,
k
)
≤
4
k
.
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