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1. CMB 2007 (vol 50 pp. 191)

Drungilas, Paulius; Dubickas, Artūras
Every Real Algebraic Integer Is a Difference of Two Mahler Measures
We prove that every real algebraic integer $\alpha$ is expressible by a difference of two Mahler measures of integer polynomials. Moreover, these polynomials can be chosen in such a way that they both have the same degree as that of $\alpha$, say $d$, one of these two polynomials is irreducible and another has an irreducible factor of degree $d$, so that $\alpha=M(P)-bM(Q)$ with irreducible polynomials $P, Q\in \mathbb Z[X]$ of degree $d$ and a positive integer $b$. Finally, if $d \leqslant 3$, then one can take $b=1$.

Keywords:Mahler measures, Pisot numbers, Pell equation, $abc$-conjecture
Categories:11R04, 11R06, 11R09, 11R33, 11D09

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