On coherent systems of projections for aleph_1 separable groups

Details On coherent systems of projections for aleph_1 separable groups On coherent systems of projections for aleph_1 separable groups

1993-08-15

arxiv.org/abs/math/9308213v1

Comm. Algebra 21 (1993), 343--353

Mathematics

Logic

Scientific paper

It is proved consistent with either CH or the negation of CH that there is
an aleph_1-separable group of cardinality aleph_1 which does not have a
coherent system of projections. It had previously been shown that it is
consistent with not CH that every aleph_1-separable group of cardinality
aleph_1 does have a coherent system of projections.

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