Publication Date
Summer 2010
Degree Type
Thesis
Degree Name
Master of Science (MS)
Department
Mathematics
Advisor
Maurice C. Stanley
Keywords
Forcing, Set theory
Subject Areas
Mathematics; Logic
Abstract
If κ is an infinite cardinal, then a subset X of the reals R is called κ-dense if between any a < b, both in R, there are exactly κ elements of X. In these terms, a famous result of Cantor says that in every model of set theory all aleph-0-dense sets of reals are isomorphic (to the rationals, Q). This result cannot be directly extended, however, since for κ =aleph-1 there exist models of set theory in which not all aleph-1-dense sets are isomorphic. On the other hand, Baumgartner has shown by the method of iterated forcing that assuming the consistency of set theory, there does exist at least one model of set theory in which all aleph-1-dense subsets are isomorphic. We present here a detailed, yet expository, account of Baumgartner's result and discuss its relevance to the Proper Forcing Axiom of contemporary set theory.
Recommended Citation
Vartanian, Michael Haig, "An Iterated Forcing Extension In Which All Aleph-1 Dense Sets of Reals Are Isomorphic" (2010). Master's Theses. 3834.
DOI: https://doi.org/10.31979/etd.dem8-u6bu
https://scholarworks.sjsu.edu/etd_theses/3834
