Papers on Beta N
 My remarks on the contributions of Mary Ellen Rudin to Beta N
 Applications of another characterization of Beta N minus N
 two to one mappings under PFA
 not contain the measure algebra under PFA
 N* and R* need not be coabsolute

Subalgebras of Partitioner algebras need not be partitioner algebras
(joint with Jinyuan Zhou: see also his thesis)
 A modification of Solovay's lemma (preserving towers) applied to radial spaces
 with Jinyuan Zhou: Two real ultrafilters on N
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