Accumulation functions on the ordinals
Extended operations and relations on the class of ordinal numbers
The axiom of choice and linearly ordered sets
Choice principles in Węglorz’ models
Węglorz' models are models for set theory without the axiom of choice. Each one is determined by an atomic Boolean algebra. Here the algebraic properties of the Boolean algebra are compared to the set theoretic properties of the model.
The relationship between two weak forms of the axiom of choice
Permutation models and topological groups
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