BLC Newsletter September 2002

Registered Charity No 275541

President           Professor J B Paris FBA [Manchester]
Vice-President      Dr J M E Hyland [Cambridge]
Secretary           Dr M Dzamonja [East Anglia]
Treasurer           Dr R Dyckhoff [St Andrews]

Committee members   Professor H D Macpherson [Leeds]
                    Dr E Ritter [Birmingham]
                    Professor T Williamson FBA FRSE [Oxford]

Dear members,

Here is the new edition of our newsletter.
With the beginning of the term approaching there seem to be many 
items coming in to report, so this time we have a longish issue of
the newsletter. In particular I am sending you as attachements a dvi
and a ps file of the Committee report for 2001. 
   Last time I reported to you sad news of the passing away of Professor
Czeslaw Lejewski. As Professor Peter Simons wrote in the obituary,
Czeslaw Lejewski (1913-2001) studied in Warsaw with Lukasiewicz, 
Lesniewski and  Kotarbinski. His Warsaw PhD was interrupted by the
war, in which Lejewski saw active service. After the war he remained 
in Britain, taking a second PhD under Popper in 1954. He joined the 
Philosophy Department at Manchester in 1956 and succeeded Prior 
as Professor there from 1966 until retirement in 1980.
   Lejewski wrote around 50 articles on logic, its history and 
philosophy, the first appearing when he was 40. Some  expound or 
simplify Lesniewski's major logical systems of mereology and 
Ontology, others offer extensions or alternatives to these, or 
reflect on the philosophical assumptions of Lesniewski's logic, 
particularly its extensionality and the interpretation of the 
quantifiers. There are also several articles on the history of logic. 
Perhaps Lejewski's best-known articles are "Logic and Existence" 
(1954) and "On Lesniewski's Ontology" (1958).
   The complete obituary appears as item (3) below.
   Let me finish by mentioning the BLC Meeting in Birmingham
that occured on September 12-14 and thanking the Organising Committee of
for excellent organisation. During this meeting we also had an Annual
General Metting of the members, the minutes of which will be circulated
soon, most likely in the next edition of the newsletter. 
   With best wishes,
Table of contents of the newsletter:

(1) Announcement of the meeting
"The Fourth De Morgan Workshop on Combining Probability and Logic" 
4th - 6th November 2002, King's College London, Strand, London.
Note the oportunity to purchase reproduced volumes of De Morgan's work
(the original appeared around 1835).
   This meeting was partially funded by BLC. 

(2) Announcement of the Logic Seminars in Leeds

(3) An obituary for Czeslaw Lejewski by Professor Peter Simons
(note the many interesting details about the dramatic events in Lejewski's

(attachements) a dvi and a ps file of the Committee Report for 2001.



The Fourth De Morgan Workshop on Combining Probability and Logic
4th - 6th November 2002
King's College London, Strand, London

How is probability related to logic?
 Should probability and logic be combined?
 If so, how?

The aim of the workshop is to address the relationship between
probability and logic from an interdisciplinary perspective. We hope
that the themes of this workshop will be of
interest to mathematicians, logicians, philosophers, computer scientists
and engineers.

Programme (provisional):

Monday 4th November
09.30-10.00 Registration
10.00-11.00 Dov Gabbay: Introduction.
11.30-13.00 Henry E. Kyburg Jr.: "Are there degrees of belief?"
14.00-15.30 Colin Howson: "Combining probability and logic"
16.00-17.30 Theo Kuipers: "Probabilistic confirmation as refinement of
deductive confirmation: non-inductive and inductive confirmation

Tuesday 5th November
09.30-11.00 Joseph Halpern: "From statistics to belief"
11.30-13.00 Jeff Paris: "Some consequences of common sense for
probabilistic reasoning"
14.00-15.30 Juerg Kohlas: "Probabilistic Argumentation"
16.00-17.30 Rachel Bourne: "Explaining default intuitions using maximum

Wednesday 6th November
09.30-11.00 Peter Flach: "Probabilistic models for structured data"
11.30-13.00 Stephen Muggleton: "Learning structure and parameters of
Stochastic Logic Programs"
14.00-15.30 John Fox: "Reasons to believe and grounds for doubt"
16.00-17.30 Questions and Discussion

The organisers are grateful to the London Mathematical Society and the
British Logic Colloquium for financial support.

The attendence fee is 15 GBP - 10 GBP for students.
If you would like to attend please contact Jane Spurr:
More details can be found at:

As an additional information for the participanys of the conference 
from the organiser, it is stated that the US publisher, Elibron, has
facsimile copies of Augustus De Morgan's book "Formal Logic: or, the
calculus of inference, necessity and probable" available.  In order to
coincide with this year's Workshop, the organisers are also asking
Elibron to prepare
copies of "An Essay on Probabilities and on their application to life
cotingencies and insurance offices".

The organisers have negotiated a special price of 12 GBP per copy, which will
be available during the course of the conference.

So that a bulk order can be placed to guarantee delivery by 4th November,
please will you let Jane Spurr know if you are interested in ordering either (or
both) titles by Thursday 17th October.  The payment will be collected in
November at the workshop.


                            UNIVERSITY OF LEEDS
                   Department of Pure Mathematcs
                          Autumn Term 2002

October 2nd Mirna Dzamonja (Norwich)
                 Embeddings of trees 

October 16th Olivier Lessmann (Oxford)
                 Categoricity in excellent classes 

October 30th John Tucker (Swansea)
                 Computability theory on topological algebras and its 

November 13th David Evans (Norwich) 
                 Amalgamation classes and independence

      The lectures will be held on Wednesdays at 4 pm in room H, 
        Mathematics building unless otherwise noted. Tea at 3.30 pm.


It is with sadness that I pass on news of the death on 9 July after a 
long illness of Czeslaw Lejewski, Professor Emeritus of Philosophy 
at the University of Manchester. He was 88, and one of the last 
surviving members of the pre-war generation of the Warsaw School 
of logicians. Lejewski's career was unusual and aspects may be of 
interest to those who did not know him as well as those that did.

Czeslaw Lejewski was born in Minsk, then in the Russian Empire, on 
14 April 1913. In 1920 his family moved to Lublin in Poland, where he 
attended Gimnazjum (roughly: Grammar School). From 1931 he 
studied Classics at Warsaw University, where he obtained a master's degree 
in 1936 with a dissertation on tropes in the sceptics. After military 
service he returned to the university in 1937 to study for a PhD in 
Classics, concentrating on ancient logic. This interest drew him to 
courses and seminars on logic given by Jan Lukasiewicz and 
Stanislaw Lesniewski and philosophy with Tadeusz Kotarbinski. His 
dissertation 'De Aenesidemi Studiis Logicis' was examined and passed among 
others by Lukasiewicz, but he was unable to take his degree due to the 
outbreak of war. He was taken prisoner by the invading Soviets and 
spent two years in terrible conditions in Soviet labour camps, before 
joining the 3rd Polish Army after the Nazi invasion of the USSR. 
There followed in 1942 an extraordinary odyssey by land and sea 
from Russia to Britain via Iran, Iraq, Egypt, South Africa, South America, 
and the USA. He worked for the Polish H.Q. in London where he 
remained until demobilized in 1948. He then taught English to Poles, 
marrying an English woman in 1949. (He remarried in 1973 after his 
wife Pauline's death and is survived by his second wife Joan.)

The communist takeover in Poland decided him to make his home in 
England, and he took up PhD studies again under Popper at the 
LSE, passing (with Lukasiewicz as examiner again) with a dissertation 
'Studies in the Logic of Propositions' in 1954. In 1956 he joined the 
Philosophy Department at Manchester University. In 1966 he 
Arthur Prior as professor, and remained there until his retirement in 
1980. He was visiting professor at Notre Dame in 1960-61 and at 
Salzburg in 1984. Despite the end of communism in Poland he did 
not return to visit his native country.

Czeslaw published around 50 articles, almost all on logic, and the 
majority comment on, reconstruct and extend the work of 
His first article appeared in 1953 when he was already 40. In my 
view he is the clearest of Lesniewski's expositors and the one who did 
most to extend his teacher's ideas. His papers are all extremely 
precise, have a clear purpose, and despite sometimes formidable 
technical detail are in structure easy to follow.  A good example is 
his contribution to the Popper Schilpp volumes, "Popper's Theory of 
Formal or Deductive Inference." A particular historical tour de force 
is the article 'Logic, History of' for the 15th edition of 
Encyclopedia Britannica. Lejewski saw the second edition (1957) of 
Lukasiewicz's Aristotle's Syllogistic through the press after 
Lukasiewicz became too ill to complete the work.

In his teaching outside logic Lejewski stayed close to classical 
texts, particularly Aristotle, but it is fair to say that his ascetic 
brand of materialistic reism (summarized in a 1976 article "Outline 
of an ontology") did not appeal to a wide range of students.

To timid students Lejewski's slightly old-fashioned Polish politeness 
coupled with a natural modesty and reserve could appear formal or 
forbidding, but over a glass of wine his reserve would disappear and 
he could become an amusing racconteur. I particularly recall him 
and the much more extrovert Jozef Bochenski trading stories about the 
rich panoply of Warsaw personalities at conferences in Manchester 
and Grenoble.

My own contact with Czeslaw deepened only after I had left Britain, 
particularly during his months in Salzburg, which he already knew 
from conference visits. Though he disagreed with my views on 
mereology he encouraged me in my project to devote a book to it.

Lejewski's work is still much admired in his native land and by 
logicians and historians of logic around the world, and at the recent 
Tarski Centenary Symposium in Warsaw the participants all signed a 
greeting postcard to him.

During his final illness Czeslaw talked of destroying his postwar 
scientific Nachlass, which for personal reasons he wanted to go 
neither to Poland nor to Manchester. With the cooperation of Joan 
Lejewska and mediated by the American logician Audoenus (Owen) 
Le Blanc, his closest confidant in his later years, I was able to secure 
his scientific books and papers for the University of Leeds, where 
they remain in Special Collections awaiting appraisal. I believe but 
do not know for sure that there are some interesting items there for 
the history of Polish logic.

I have a fairly complete bibliography (to 1983) and a moderately 
complete set of offprints of Lejewski's work so if anyone is 
interested in seeing or reading more they are welcome to ask me.

Professor Peter Simons
School of Philosophy
University of Leeds
Leeds LS2 9JT
Tel +44 113 233 3298
Fax +44 113 233 3265

Report of the BLC-committee for 2001

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