People. | Prof. dr. Benedikt Löwe |
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Dr. Lorenzo Galeotti | |

Dr. Yurii Khomskii | |

Robert Passmann, M.Sc. | |

Ned Wontner, M.Math.Phil. M.Phil. |

**Research Seminar.**

Fri 25 Oct. 12-13 Room F1.15 | Asaf Karagila | Stranger Things: The ZF-verse obtained by adding just one Cohen to L | Abstract: Adding a single Cohen real to L provides us with a lattice of intermediate models, but if we only consider models of ZFC, these models are all somehow very similar (except L itself). Without assuming the Axiom of Choice in those intermediate models we have a very different picture. We will discuss the construction of the Bristol model, which is a model between L and L[c], which does not have the form L(x) for any set x. |
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Tue 17 Dec. 14:30 Room F1.15 | Hrafn Oddsson | A Model for Paradefinite Set Theory | Abstract: A paradefinite logic is a logic that is both paraconsistent and paracomplete. In this talk we introduce a framework for models of paradefinite set theories based of Thierry Libert's work in paraconsistent set theory. We then present a model of paradefinite set theory which can be seen as the result of enriching the classical von Neumann universe of sets with various non-classical sets. We will also discuss the axiomatization of the theory of this model. |

Last changed: 26 November 2020