20 search results - page 3 / 4 » mlq 2008 |
MLQ
2008
14 years 10 months ago
2008
We compare two Picard groups in dimension one. Our proofs are constructive and the results generalize a theorem of J. Sands [11]. MSC 2000: 13C15, 13C20, 03F65, 13F45
MLQ
2008
14 years 10 months ago
2008
Abstract. We continue investigations of reasonable ultrafilters on uncountable cardinals defined in Shelah [8]. We introduce a general scheme of generating a filter on from filter...
MLQ
2008
14 years 10 months ago
2008
We study, from a classical point of view, how the truth of a statement about higher type functionals depends on the underlying model. The models considered are the classical set-t...
MLQ
2008
14 years 10 months ago
2008
We study statements about countable and well ordered unions and how they are related to each other and to countable and well ordered forms of the axiom of choice.
MLQ
2008
14 years 10 months ago
2008
We show that there is a model of ZF in which the Borel hierarchy on the reals has length 2. This implies that 1 has countable cofinality, so the axiom of choice fails very badly i...