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

[Jonas Haldimann]

Hi everyone,

this is a brief reminder for the talk by *Andreas Herzig *in our next 
NMR Online Seminar *today at 16:00*.

See you there!


Am 07.12.25 um 17:11 schrieb Jonas Haldimann:
>
>
>       NMR Online Seminar
>
>
> -- Summary: 
> ------------------------------------------------------------------
>
> 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/
> ------------------------------------------------------------------------------
>
> 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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