Mathematics – Logic
Scientific paper
2010-03-24
Archive for Mathematical Logic 50, no. 5 (2011) , pp 515-529
Mathematics
Logic
15 pages, submitted to Israel Journal of Mathematics
Scientific paper
10.1007/s00153-011-0228-9
We show that Vopenka's Principle and Vopenka cardinals are indestructible under reverse Easton forcing iterations of increasingly directed-closed partial orders, without the need for any preparatory forcing. As a consequence, we are able to prove the relative consistency of these large cardinal axioms with a variety of statements known to be independent of ZFC, such as the generalised continuum hypothesis, the existence of a definable well-order of the universe, and the existence of morasses at many cardinals.
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