L", L1, L2,
([0, 1], B[0,1], l[0,1])
fn(x) := n2/31[0,1/n](x),
n+1
fn(x) := 1[{ n (x), {·}
1/2[log2 k]},{ 1/2[log2 k]}]
k=1 k=1
[·]
x
fn(x) := sin(n),
fn(x) := (1 - x/n)n.
f L1 g L2,
f = g
L2([0, 1], B[0,1], l[0,1])
0 L2([0, 1], B[0,1], l[0,1]).