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Reverse mathematics of separably closed sets

✍ Scribed by Jeffry L. Hirst

Publisher: Springer
Year: 2005
Tongue: English
Weight: 105 KB
Volume: 45
Category: Article
ISSN: 0933-5846
DOI: 10.1007/s00153-005-0298-7

No coin nor oath required. For personal study only.

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We use a lower bound on the number of small sets in an idea1 to show that for each unionclosed family of n sets there exists an element which belongs to at least of them, provided n is large enough.