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    Da Koizumi ad Abe : l'evoluzione dei rapporti sino-giapponesi

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    Analisi delle scelte di politica estera ed interna del nuovo governo giapponese

    Small values of signed harmonic sums

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    For every τ∈R and every integer N, let mN(τ) be the minimum of the distance of τ from the sums ∑n=1Nsn/n, where s1,...,sn∈−1,+1. We prove that mN(τ)<exp⁡(−C(log⁡N)2), for all sufficiently large positive integers N (depending on C and τ), where C is any positive constant less than 1/log⁡4
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