=+5.34. Prove Carlsons inequality: If f 0 on [0, ), then 0 f(x) dx

Question:

=+5.34. Prove Carlson’s inequality: If f ≥ 0 on [0, ∞), then

 ∞

0 f(x) dx ≤ √π

 ∞

0 f 2(x) dx 1/4  ∞

0 x2f 2(x) dx 1/4

.

[Hint: For any

a, b > 0, write

 ∞

0 f(x) dx =

 ∞

0 1

√a + bx2 a + bx2f(x) dx.

5.7 Exercises 169 Also, note that  ∞

0 (a + bx2)−1 dx = π/2

ab. ]

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