Results 181 to 190 of about 1,294 (213)

On Boolean Algebras and their Recursive Completions

Mathematical Logic Quarterly, 1985
Let B be a countable atomless Boolean algebra with a fixed bijective indexing \(\phi\) : \(\omega\to B\) such that the induced operations on \(\omega\) are recursive. An automorphism of B is said to be recursively presented if the induced permutation of \(\omega\) is recursive.
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Regular subalgebras of complete Boolean algebras

Journal of Symbolic Logic, 2001
AbstractIt is proved that the following conditions are equivalent:(a) there exists a complete, atomless, σ–centered Boolean algebra, which does not contain any regular, atomless, countable subalgebra.(b) there exists a nowhere dense ultrafilter on ω.Therefore, the existence of such algebras is undecidable in ZFC.
Blaszczyk, Aleksander, Shelah, Saharon
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The Completion of a Boolean Algebra

1973
For the following let X be a topological space, and let S ⊆ X be a subspace of X with the relative topology. The topological operations -, ° and -s, os refer to X and S respectively.
Gaisi Takeuti, Wilson M. Zaring
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Dense subtrees in complete Boolean algebras

Mathematical Logic Quarterly, 2006
AbstractWe characterize complete Boolean algebras with dense subtrees. The main results show that a complete Boolean algebra contains a dense tree if its generic filter collapses the algebra's density to its distributivity number and the reverse holds for homogeneous algebras. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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How can hospitals change practice to better implement smoking cessation interventions? A systematic review

Ca-A Cancer Journal for Clinicians, 2022
Anna Ugalde, Vicki White, Nicole M Rankin   +2 more
exaly  

Current treatment and future directions in the management of anal cancer

Ca-A Cancer Journal for Clinicians, 2022
Leila T Tchelebi, Cathy Eng, Craig A Messick   +2 more
exaly  

Matroids on Complete Boolean Algebras

1970
Doctor of Philosophy (PhD)
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Embedding of free Boolean algebras in complete Boolean algebras

Journal of Soviet Mathematics, 1975
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Completing Boolean Algebras by Nonstandard Methods

Mathematical Logic Quarterly, 1974
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Towards complete and error-free genome assemblies of all vertebrate species

Nature, 2021
Arang Rhie, Shane A Mccarthy, Olivier Fedrigo   +2 more
exaly