A class of -preduals which are isomorphic to quotients of
For every countable ordinal α, we construct an -predual which is isometric to a subspace of and isomorphic to a quotient of . However, is not isomorphic to a subspace of .
A class of sets whose distance set fills an interval
A classification of ordinals up to Borel isomorphism
We consider the Borel structures on ordinals generated by their order topologies and provide a complete classification of all ordinals up to Borel isomorphism in ZFC. We also consider the same classification problem in the context of AD and give a partial answer for ordinals ≤ω₂.
A continuum of totally incomparable hereditarily indecomposable Banach spaces
A family is constructed of cardinality equal to the continuum, whose members are totally incomparable hereditarily indecomposable Banach spaces.
A generalized version of the singular cardinals problem
A Note On Ultrapower Cardinality
A note on ultrapower cardinality.
A problem on series of ordinals
A Remark On Filter Regularity
A remark on filter regularity.
A well ordering of the Cartesian product of two ordinals
Accumulation functions on the ordinals
Algebraic equivalence of ordinal numbers
Algorithmic representations of Wermus' constructions of ordinal numbers
An ordering of the set of natural numbers based on Peano axioms
Arithmetic of cuts and cuts of classes