Proper Forcing

Uri Abraham ()
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Uri Abraham: Ben Gurion University of the Negev, Department of Mathematics

Chapter 5 in Handbook of Set Theory, 2010, pp 333-394 from Springer

Abstract: Abstract The aim of this chapter is to develop the theory of proper forcings and their iteration and to provide interesting examples of its usefulness and range of applications. Our presentation is detailed and should be accessible to any reader who is familiar with the Solovay and Tennebaum technique of finite support iteration and the proof that the c.c.c. property is preserved. We present the basic preservation theorem of the properness property under countable support iteration, and continue with additional preservation theorems—all due to Shelah. Each abstract preservation theorem is followed by an application which shows its relevance. A longer section deals with posets that add no new countable sets and their iteration.

Keywords: Chromatic Number; Continuum Hypothesis; Countable Support; Elementary Substructure; Supercompact Cardinal (search for similar items in EconPapers)
Date: 2010
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DOI: 10.1007/978-1-4020-5764-9_6

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