**Lemma 3.10.1** *Let be given by (2.184) with a(t) as in Assumption 2.4.5. It results that*

*Proof:* Since a(t) has finite support [− 1/2, 1/2), to prove (3.155) is equivalent to prove that

Let us consider first the case .

Since a(t) is Riemann integrable (Assumption 2.4.5), we have

(3.157)

Let us consider now the case , ν > 0.

For every the function is Riemann integrable and we have

that is, ∀_{1} > 0 such that for ...

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