## Abstract We continue investigations of __reasonable ultrafilters__ on uncountable cardinals defined in Shelah [8]. We introduce a general scheme of generating a filter on __λ__ from filters on smaller sets and we investigate the combinatorics of objects obtained this way. (© 2008 WILEY‐VCH Verla
Q-ultrafilters and normal ultrafilters in B-algebras
✍ Scribed by Bronisław Tembrowski
- Publisher
- Springer Netherlands
- Year
- 1986
- Tongue
- English
- Weight
- 814 KB
- Volume
- 45
- Category
- Article
- ISSN
- 0039-3215
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✦ Synopsis
The firs~ par~ of the paper deals with some subclasses of B-algebras ~t~d Sheir applications to the semantics of SCI n, ~he Boolean s~rengthening of the sentential calculus with i~lentity (SCI). In the second part a generalization of the ~cKinsey-Tarski construction of well.connected topological Boolean algebras to the class of B-algebras is given.
and a, b-.aob is ~n addStional binary operation on A. Algebras of this kind, their rel.~tionships to some known classes of algebras as well as the theory of filters and congruences in B-algebras were investigated in [14]. Recall that ~ Boolean filter V is a Q-filter in d if a relation ~ (defined by a ~ b V g iff (aob)e V for every a, b cA) is a congruence of d compatible with V~ and V is a normal filter provided that ~ is the identity. B-algebras J-):EPARTMENT OF ~/~ATILEMA~IOS PEDAGOGICAL UNIVERSITY
📜 SIMILAR VOLUMES
## Abstract We prove, in ZFC alone, some new results on regularity and decomposability of ultrafilters; among them: (a) If __m__ ≥ 1 and the ultrafilter __D__ is (~__m__~(__λ__^+__n__^), ~__m__~(__λ__^+__n__^))‐regular, then __D__ is __κ__ ‐decomposable for some __κ__ with __λ__ ≤ __κ__ ≤ 2^__λ__^