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Cellular objects and Shelah's singular compactness theorem

By Tibor Beke and Jiri Rosicky
The best-known version of Shelah's celebrated singular cardinal compactness theorem states that if the cardinality of an abelian group is singular, and all its subgroups of lesser cardinality are free, then the group itself is free. The proof can be adapted to cover a number of analogous situations in the... Show more
June 15, 2014
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Cellular objects and Shelah's singular compactness theorem
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