Let $q$ be an odd integer, let $\tau$ be the order of $2$ modulo $q$ and let $\xi$ be a primitive $q$th root of unity. Upper bounds for $\sum_{k=1}^\tau \xi^{2^k}$ are proved in terms of the parameters $\mu$ and $\nu$ when $q$ diverges along sequences $S_{\mu,\nu}$ for which the quotient $\tau/\log_2 q$ belongs to the interval $[\mu,\nu]$, with $1\leq \mu$ and $\nu$ close enough to $1$.

Cancellation in a short exponential sum / G. Molteni. - In: JOURNAL OF NUMBER THEORY. - ISSN 0022-314X. - 130:9(2010 Sep), pp. 2011-2027. [10.1016/j.jnt.2010.03.002]

### Cancellation in a short exponential sum

#### Abstract

Let $q$ be an odd integer, let $\tau$ be the order of $2$ modulo $q$ and let $\xi$ be a primitive $q$th root of unity. Upper bounds for $\sum_{k=1}^\tau \xi^{2^k}$ are proved in terms of the parameters $\mu$ and $\nu$ when $q$ diverges along sequences $S_{\mu,\nu}$ for which the quotient $\tau/\log_2 q$ belongs to the interval $[\mu,\nu]$, with $1\leq \mu$ and $\nu$ close enough to $1$.
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Exponential sums ; k-Representations
Settore MAT/05 - Analisi Matematica
JOURNAL OF NUMBER THEORY
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/143298
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