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:<math>\omega_n(t,f,[a,b])=\omega_n\left(\frac{b-a}{n},f,[a,b]\right),\text{ for }t>\frac{b-a}{n},</math>
where we the [[finite difference]] (''n''-th order forward difference) are defined as
:<math>\Delta_h^n(f,x_0)=\sum_{i=1}^n(-1)^{n-i}\binom{n}{i} f(x_0+ih).</math>
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