The rearrangement number
The rearrangement number
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DOI:
10.1090/tran/7881
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发表时间:
2020
影响因子:
1.3
通讯作者:
Larson Paul B.
中科院分区:
文献类型:
--
作者:
Blass Andreas;Brendle Joerg;Brian Will;Hamkins Joel David;Hardy Michael;Larson Paul B.
How many permutations of the natural numbers are needed so that every conditionally convergent series of real numbers can be rearranged to no longer converge to the same sum? We define the rearrangement number, a new cardinal characteristic of the continuum, as the answer to this question. We compare the rearrangement number with several natural variants, for example one obtained by requiring the rearranged series to still converge but to a new, finite limit. We also compare the rearrangement number with several well-studied cardinal characteristics of the continuum. We present some new forcing constructions designed to add permutations that rearrange series from the ground model in particular ways, thereby obtaining consistency results going beyond those that follow from comparisons with familiar cardinal characteristics. Finally, we deal briefly with some variants concerning rearrangements by a special sort of permutation and with rearranging some divergent series to become (conditionally) convergent. References
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