We have seen in Chapter 15 how we can extend models of ZFC to models in which, for example, CH fails—supposed we have suitable generic filters at hand. On the other hand, we have also seen that there is no way to prove that generic filters exist.

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Proving Unprovability

  • Lorenz J. Halbeisen

摘要

We have seen in Chapter 15 how we can extend models of ZFC to models in which, for example, CH fails—supposed we have suitable generic filters at hand. On the other hand, we have also seen that there is no way to prove that generic filters exist.