Diamond and antichains

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Archive for Mathematical Logic 44 (1):71-76 (2005)
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Abstract

It is obvious that ♦ implies the existence of an antichain of stationary sets of cardinality which is the largest possible cardinality. We show that the obvious antichain is not maximal and find a less obvious extension of it by ℵ2 more stationary sets

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10.1007/s00153-004-0247-x

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