An inequality about irreducible factors of integer polynomials. (English) Zbl 0648.12002

Mignotte, Maurice

J. Number Theory 30, No. 2, 156-166 (1988).

Let \(F(X)=a_0+a_1X+a_2X^2+ \ldots +a_dX^d\) be a polynomial of degree \(d\) with complex coefficients. The author gives an upper bound for \(\max \{| F(z)|: | z| =1\}\) in the case when \(F(X)\) is an irreducible polynomial with integral coefficients. The upper bound involves the measure of \(F\), namely, \(M(F)=| a_d| \prod^{d}_{j=1} \max \{1, |z_j|\}\), where \(z_1,\ldots, z_d\) are the complex roots of \(F\). A special case of the author’s result is the following inequality: \[ \left(\sum^d_{i=0}| a_i|^2\right)^{1/2}\le e^{\sqrt{d}}(d+2\sqrt{d}+2)^{1+\sqrt{d}}M(F)^{1+\sqrt{d}}. \]

Reviewer: Kenneth S. Williams (Ottawa)

MSC:

11R09	Polynomials (irreducibility, etc.)
11C08	Polynomials in number theory

Keywords:

measure of polynomial; inequality; irreducible factors of integer polynomials

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