Results 101 to 110 of about 945 (231)

Weakly Dense Subsets of Homogeneous Complete Boolean Algebras [PDF]

open access: yes, 1990
The primary result from this dissertation is following inequality: d(B) ≤ min(2^< wd(B),sup{λ^c(B): λ < wd(B)}) in ZFC, where B is a homogeneous complete Boolean algebra, d(B) is the density, wd(B) is the weak density, and c(B) is the cellularity of B ...
Bozeman, Alan Kyle
core  

Using Whales to Complete a Boolean Algebra

open access: yesMissouri Journal of Mathematical Sciences, 2002
Let \(B\) be a Boolean algebra and \(A\) be a subset of \(B\). Then \(A\) is called a whale of \(B\) if (1) \(a\in A,\) \(b\in B\) and \(b \leq a\) imply \(b\in A\); (2) sup\(\{a \mid a\in A\}=1\). The author uses the whales of \(B\) to construct the completion of \(B\).
openaire   +3 more sources

Uniformly Closed Algebras Generated by Boolean Algebras of Projections in Locally Convex Spaces

open access: yes, 1987
The theory of operator algebras in Banach spaces generated by Boolean algebras of projections is by now well known. It is systematically exposed in the penetrating studies of W. Bade, [1], [2] and [6, Chapter XVII].
Werner Ricker
core   +1 more source

Complete Boolean Algebras and Extremally Disconnected Compact Spaces

open access: yes, 2014
We study the existence of special points in extremally disconnected compact topological spaces that witness their nonhomogeneity. Via Stone duality, we are looking for ultrafilters on complete Boolean algebras with special combinatorial properties.
Starý, Jan
core  

Independent families in complete Boolean algebras

open access: yes, 1982
We present a proof (without any set-theoretical assumptions) that every infinite complete Boolean algebra includes a free subalgebra of the same cardinality. It follows that the set of all ultrafilters on an infinite complete Boolean algebra B
B. Balcar, F. Franěk
core   +1 more source

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