Studia Logica

, Volume 100, Issue 1–2, pp 163–173 | Cite as

Fatal Heyting Algebras and Forcing Persistent Sentences

Open Access


Hamkins and Löwe proved that the modal logic of forcing is S4.2. In this paper, we consider its modal companion, the intermediate logic KC and relate it to the fatal Heyting algebra H ZFC of forcing persistent sentences. This Heyting algebra is equationally generic for the class of fatal Heyting algebras. Motivated by these results, we further analyse the class of fatal Heyting algebras.


forcing intermediate logics Heyting algebra 


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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  1. 1.Institute for Logic, Language and ComputationUniversiteit van AmsterdamAmsterdamThe Netherlands
  2. 2.Fachbereich MathematikUniversität HamburgHamburgGermany

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