#### 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.

http://scholarworks.sjsu.edu/etd_theses/3834