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math.NT2014
On conjectures and problems of Ruzsa concerning difference graphs of S-units
Ante Custic, Lajos Hajdu, Dijana Kreso +1
Given a finite nonempty set of primes S, we build a graph with vertex set by connecting x and y if the prime divisors of both the numerator and denominat…
math.CO2014
Representation of finite graphs as difference graphs of S-units, I
K. Győry, L. Hajdu, R. Tijdeman
Let G be a simple finite graph such that each vertex has an integer value and different vertices have different values. Let S be a finite non-empty set of primes. We call G an S-gr…