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η$_{k}$ = s$_{k}$ − τ/ 2 . One can find an integer j$_{k}$ with 1 ≤ j$_{k}$ ≤ n such that 

Using (7.22) one can obtain for t ∈ [ η$_{k}$, η$_{k}$ + τ ] that 

Moreover, inequality (7.23) yields 

for all t ∈ [ η$_{k}$, η$_{k}$ + τ ] . Since there exist numbers r$_{1}$, r$_{2}$, . . . , r$_{n}$ ∈ [ η$_{k}$, η$_{k}$ + τ ] satisfying 

we have that 

Let ζ ∈ Θ be an arbitrary sequence. Making use of the relations 

and 

it can be deduced that 

Hence, 

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