The Jónsson Class of Boolean Algebras

  • W. Wistar Comfort
  • Stylianos Negrepontis
Part of the Die Grundlehren der mathematischen Wissenschaften book series (GL, volume 211)


The general results of the theory of Jónsson classes, developed in §4, are applied here to the Jónsson class of (proper) Boolean algebras. The α-homogeneous-universal Boolean algebra ℭ α of cardinality a and its Stone space S α , which exist if and only if \(\alpha = {\alpha ^{\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle\smile}$}}{\alpha } }}\), are studied in considerable detail and characterized by properties given in terms of the partial order of a Boolean algebra; these properties are similar to the η α -property of ordered sets (studied in §5). We study the Jónsson class of Boolean algebras not mainly to illustrate the general theory of Jónsson classes, but rather in order to describe the space S α itself; in later sections some of its properties will be set in analogy or contrast to those of certain spaces of ultrafilters. There are intriguing parallels between some rather refined properties of S α and corresponding properties of the space U(α + ) (to be defined in § 7) of uniform ultrafilters on α+ the particular case α = ω+=2 ω the space S ω + indeed is homeomorphic to the space (of non-principal ultrafilters on ω) ß(ω)\ ω (cf. the introduction and results of § 14 and § 15).


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Copyright information

© Springer-Verlag Berlin · Heidelberg 1974

Authors and Affiliations

  • W. Wistar Comfort
    • 1
  • Stylianos Negrepontis
    • 2
    • 3
  1. 1.Department of MathematicsWesleyan UniversityMiddletownUSA
  2. 2.Department of MathematicsAthens UniversityAthensGreece
  3. 3.Department of MathematicsMcGill UniversityMontréalCanada

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