Pythagorean Partition-Regularity and Ordered Triple Systems with the Sum Property

Details Pythagorean Partition-Regularity and Ordered Triple Systems with the Sum Property Pythagorean Partition-Regularity and Ordered Triple Systems with the Sum Property

2008-09-20

arxiv.org/abs/0809.3478v1

Mathematics

Combinatorics

8 pages, 2 figures

Scientific paper

Is it possible to color the naturals with finitely many colors so that no Pythagorean triple is monochromatic? This question is even open for two colors. A natural strategy is to show that some small nonbipartite triple systems cannot be realized as a family of Pythagorean triples. It suffices to consider partial triple systems (PTS's), and it is therefore natural to consider the Fano plane, the smallest nonbipartite PTS. We show that the Pythagorean triples do not contain any Fano plane. In fact, our main result is that a much larger family of "ordered" triple systems (viz. those with a certain "sum property") do not contain any Steiner triple system (STS).

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