Killing the GCH everywhere with a single real

Sy David Friedman; Mohammad Golshani

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arXiv · 1510.02933

Killing the GCH everywhere with a single real

Sy David Friedman·Mohammad Golshani

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Abstract

Shelah-Woodin investigate the possibility of violating instances of $GCH$ through the addition of a single real. In particular they show that it is possible to obtain a failure of $CH$ by adding a single real to a model of $GCH$, preserving cofinalities. In this article we strengthen their result by showing that it is possible to violate $GCH$ at all infinite cardinals by adding a single real to a model of $GCH.$ Our assumption is the existence of an $H(κ^{+3})$-strong cardinal, by work of Gitik and Mitchell it is known that more than an $H(κ^{++})$-strong cardinal is required.

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Sy David Friedman, Mohammad Golshani. 2015-10-10. Killing the GCH everywhere with a single real. https://arxiv.org/abs/1510.02933

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