# Some remarks on set theory

@inproceedings{Erds1950SomeRO,
title={Some remarks on set theory},
author={P. Erd{\"o}s},
year={1950}
}
Let there be given n ordinals a,, a2, , * , a,n. It is well known that every ordinal can be written uniquely as the sum of indecomposable ordinals. (An ordinal is said to be indecomposable if it is not the sum of two smaller ordinals.) Denote by +(a) the largest of these indecomposable ordinals belonging to a. ( (aj may have a coefficient c in the decomposition of a.) Put y = mini6, (4ai), and assume that there are k a's with o(ac) =,y. Denote these a's by a1, a2, * * *, ak. If in the sum ail… Expand
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#### References

1 . The property B(t) is not "'monotonic" in any direction
• 1 . The property B(t) is not "'monotonic" in any direction