A Statement in Combinatorics that is Independent of ZFC (an exposition)

Details A Statement in Combinatorics that is Independent of ZFC (an exposition) A Statement in Combinatorics that is Independent of ZFC (an exposition)

2012-01-05

arxiv.org/abs/1201.1207v1

Mathematics

Combinatorics

12 pages

Scientific paper

It is known that, for any finite coloring of the naturals, there exists distinct naturals $e_1,e_2,e_3,e_4$ that are the same color such that $e_1+e_2=e_3+e_4$. Consider the following statement which we denote S: For every $\aleph_0$-coloring of the reals there exists distinct reals $e_1,e_2,e_3,e_4$ such that $e_1+e_2=e_3+e_4$?} Is it true? Erdos showed that S is equivalent to the negation of the Continuum Hypothesis, and hence S is indepedent of ZFC. We give an exposition of his proof and some modern observations about results of this sort.

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