If is a real algebraic irrational number and , thenhas only finitely many reduced rational solutions .
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Roth's theorem is a result in number theory that pertains to the distribution of arithmetic progressions in subsets of natural numbers. It is particularly significant in additive combinatorics and deals with the existence of long arithmetic progressions within sets of integers. The theorem states that any subset \( A \) of the integers (specifically, the natural numbers) with positive upper density cannot avoid having an arithmetic progression of length 3.