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    ELECTRONIC NEWSLETTER ON  REASONING ABOUT ACTIONS AND CHANGE        
Issue 98076             Editor: Erik Sandewall             4.10.1998
    Back issues available at http://www.ida.liu.se/ext/etai/rac/
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                    *********  TODAY  *********

The present Newsletter contains several contributions that are too
long to be included here in full. We therefore only advertise their
topics, and refer to the full text via the web links which can
be found, as usual, in the actions and change section of the ETAI 
Junction (= the overall webpage structure that has been set up for
the ETAI and its side-activities).



                   *********  DEBATES  *********

                   ---  ONTOLOGIES FOR TIME  ---

Johan van Benthem has commented on our discussion on ontologies of
time in a note with the title *Points on Time*. He summarizes
the discussion, puts it into the perspective of historical and
contemporary issues in philosophy, and gives his own analysis of
the dividing instant problem as well as underlying and more general
issues. Johan van Benthem's note can be accessed at
    http://www.ida.liu.se/ext/etai/rac/notes/1998/03/debet.html


                    ---  MODAL LOGICS IN KR  ---

Lats year, *Studia Logica* published a note by John McCarthy
entitled "Modality, si! Modal logic, no!" The Journal of Logic, Language, 
and Information recently had a recent special issue on modal logic, 
including an editorial by Heinrich Wansing, of the university of 
Leipzig, Germany, with the title "Modality, of course! Modal logic, si!"

The ENRAC Newsletter proposes to open this controversy to an open
debate, since we know that several members of our community has
clear opinions on the matter. We therefore invite long as well as 
short discussion contributions from the readership and also from 
others who wish to participate, including of course those in the 
philosophical logic community.

McCarthy's article is on his web page, and is available at
    http://www-formal.stanford.edu/jmc/modality.html
For Wansing's editorial, which was not previously posted on the web, 
Kluwer Academic Publishers who publish the journal have kindly given 
the permission so that we can post this editorial on the ETAI website. 
It is now available at
    http://www.ida.liu.se/ext/etai/rac/notes/1998/02/debet.html

Short contributions to this discussion will be represented as in
all our other on-line discussions, so they can be sent by an ordinary
E-mail message to the present editor. Longer contributions are
better represented as ENRAC research notes, in the same format as
we have used for the Wansing editorial. They also can be sent in as
plain "ascii" text. If you should have special requirements besides 
plain text, for example if the contribution contains a considerable 
number of formulae, then please contact the editor for formatting 
instructions.



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