Back to Minimum overlap problem
n
= 4
for 0
≤
x
< 1/2
for 1/2
≤
x
≤ 1
f
(
x
) =
f
(2-
x
)
for 1
<
x
≤ 2
α(
f
) = 2/5 = 0.4
maximal for |
k
| ≤ 1/2
