arXiv math/04042682004-04math.NT

Simultaneous approximation by conjugate algebraic numbers in fields of transcendence degree one

Damien Roy

备注：: 25 pages, minor corrections from version 1, to appear in International Journal of Number Theory
发表信息：: International J. Number Theory, vol. 1 (2005), 357-382

英文摘要：

We present a general result of simultaneous approximation to several transcendental real, complex or p-adic numbers xi_1,...,xi_t by conjugate algebraic numbers of bounded degree over Q, provided that the given transcendental numbers xi_1,...,xi_t generate over Q a field of transcendence degree one. We provide sharper estimates for example when xi_1,...,xi_t form an arithmetic progression with non-zero algebraic difference, or a geometric progression with non-zero algebraic ratio different from a root of unity. In this case, we also obtain by duality a version of Gel'fond's transcendence criterion expressed in terms of polynomials of bounded degree taking small values at xi_1,...,xi_t.

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