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Linear configurations containing 4-term arithmetic progressions are uncommon

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arxiv 2106.06846 v3 pith:T5HHMGFZ submitted 2021-06-12 math.CO math.NT

Linear configurations containing 4-term arithmetic progressions are uncommon

classification math.CO math.NT
keywords arithmeticcoloringconfigurationcontainingeverylargelinearmathbb
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A linear configuration is said to be common in $G$ if every 2-coloring of $G$ yields at least the number of monochromatic instances of a randomly chosen coloring. Saad and Wolf asked whether, analogously to a result by Thomason in graph theory, every configuration containing a 4-term arithmetic progression is uncommon. We prove this in $\mathbb{F}_p^n$ for $p\geq 5$ and large $n$ and in $\mathbb{Z}_p$ for large primes $p$.

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