1,721,053 research outputs found

    On a problem of cyclic permutations of integers

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    AbstractWe consider a problem of cyclic permutations of integers arising in the field of memory technologies for computer systems, and we solve it in the more general case of reals

    Value-sets of polynomials at pp-adic integers

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    In this paper we are concerned with the classification of the subsets AA of Zp\Z_p which occur as images f(Zpr)f(\Z_p^r) of polynomial functions f:ZprZpf:\Z_p^r\to \Z_p, limiting ourselves to compact-open subsets (i.e. finite unions of open balls). We shall prove three main results: (i) Every compact-open AZpA\subset \Z_p is of the shape A=f(Zpr)A=f(\Z_p^r) for suitable rr and fZp[X1,,Xr]f\in\Z_p[X_1,\ldots ,X_r]. (ii) For each r0r_0 there is a compact-open AA such that in (i) we cannot take r<r0r<r_0. (iii) For any compact-open set AZpA\subset \Z_p there exists a polynomial f\in\Q_p[X] such that f(Zp)=Af(\Z_p)=A. We shall also discuss in more detail which sets AA can be represented as f(Zp)f(\Z_p) for a polynomial fZp[X]f\in\Z_p[X] in a single variable

    L'influenza di David Hilbert nella teoria dei numeri

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    I contributi di Hilbert nella teoria dei numeri sono molteplici. Ci soffermeremo solo su due aspetti, che sembra abbiano influenzato in grande misura la teoria dei numeri nel  ventesimo secolo: la teoria dei corpi di classe e il teorema di irriducibilità. Infine daremo brevi cenni sui problemi riguardanti la teoria dei numeri nella famosa lista dei 23 problemi di Hilbert.<br /
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