[PlanetKR] NMR Online Seminar – Next Talk on December 10 by Andreas Herzig

[Jonas Haldimann]

      NMR Online Seminar


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What?    Next talk in the NMR online talk series by Andreas Herzig
When?    Wednesday, 10. December 2025, 16:00 CET (UCT+1)
Where?   Online (Zoom): 
https://uct-za.zoom.us/j/92600685092?pwd=ErqWWWKrljbjxLi0CNsgEZr4WR7ZHN.1

https://nmrseminar.krportal.org/
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We are happy to announce that the NMR online talk series restarts after 
the summer break with a talk given by
*Andreas Herzig* (IRIT)
    on *Wednesday, 10. December 2025*, 16:00 CET:

Relevance and irrelevance in classical and modal revision

/Abstract./ Two different notions of irrelevance have been much debated 
in the belief revision literature: irrelevance of syntax and irrelevance 
of a piece of information. The former is a basic postulate of the AGM 
framework but has been criticised as being too strong. The latter may be 
violated by AGM revision operations, and Parikh (followed by, among 
others, Makinson and Peppas) has argued that such a postulate should be 
added to the AGM framework. My talk will re-examine several aspects of 
irrelevance. First, I will argue that if one takes the arguments for 
syntax relevance seriously then an operation of reformulation of belief 
bases should be added to the picture. Second, I will argue for syntax 
irrelevance by showing that the most striking counter-examples can be 
accommodated if classical material implication is replaced by strict 
implication. Third, I will show that this leads to an account of 
revision operations for modal logics. Fourth, I will weaken Parikh's 
relevance postulate to an intuitively appealing postulate of vocabulary 
preservation that may also be violated by AGM revision operations. 
Fifth, I will define a modal revision operation satisfying AGM, 
vocabulary preservation, and relevance.
The talk is based on two papers that were presented at AAAI 2025: "On 
the Logic of Theory Base Change: Reformulation of Belief Bases" (with 
E.L. Fermé and M.V. Martinez) and "Minimal Change in Modal Logic S5" 
(with C. Aguilera-Ventura and J. Ben-Naim), as well as ongoing work.

The talk will be given via Zoom.

The plan of this series to have a talk roughly once per month. If you 
are interested in learning the next speakers, please visit the website at
https://nmrseminar.krportal.org/

We are still looking for speakers for future talks. If there is 
something you would like to present in this seminar series, please do 
not hesitate to contact us.

Kind regards,
Jonas and Giovanni



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