ELFT HÍRADÓ

["Laszlo E. Szabo" <leszabo AT hps.elte.hu>]

ELTE TTK Tudomanytortenet es Tudomanyfilozofia Tanszek
Budapest, Pazmany P. setany 1/A

TUDOMANYFILOZOFIA SZEMINARIUM
(http://hps.elte.hu/seminar)
________________________
2000, December

December 4.
16:00
6. em. 6.54

K o n d o r   I m r e
ELTE, Komplex Rendszerek Fizikaaja Tanszeek

Alkalmazhatook-e az elmeeleti fizika moodszerei a peenzuegytanban?

Az el'oadaas a koevetkez'o keerdeeseket kiivaanja koerueljaarni:
Hogyan ees mieert alakult ki az a helyzet, hogy a fejlett vilaag peenzuegyi
inteezmeenyei az elmuult tiiz eevben egyre nagyobb szaamban alkalmaznak
fizikusokat?
Mit csinaalnak a fizikusok ezen a terueleten?
Milyen temaakkal foglalkozik az "oekonofizika"?
Mennyiben aallithatook a piacok a fizikaaban vizsgaalt "komplex
rendszerekkel" analoogiaaba, ees milyen meerteekben alkalmazhatook a fizika
moodszerei a leiiraasukra?
Az el'oadaas veegeen illusztraaciookeent roeviden elemezzuek a racionaalis
portfoolioovaalasztaas Markowitz-feele elmeeleteenek ees az opciooaarazaas
Black-Scholes-feele elmeeleteenek a piacok fejl'odeeseere gyakorolt hataasaat.

December 11.
16:00
6. em. 6.54

B o j a n   B o r s t n e r
Department of Philosophy, University of Maribor, Slovenija

STATES OF AFFAIRS, UNIVERSALS AND SINGULAR CAUSATION

In this lecture we search for a theory that will (at least implicitly) define
the concept of causation.
1. Ontology
(i)The world contains a number of individuals. Individuals are first order
particulars, which are things taken along with all their properties.
(ii) Properties and relations are fundamental constituents of the world.
What properties and relations there are can not be determinate a priori,
but a posterior, empirically, on the basis of total science.
(iii) Properties and relations are conceived of as universals.
(iv) Individuals, properties and relations are constituents of states of
affairs
(v) There are complex and simple properties.
(vi) Complex properties have constituents that are:
      (a) not ultimate -  complexity without simple constituents
      (b) Ultimate - simple  properties that are finite or infinite in number 
-
complexity  may be finite or infinite.
2. Theory of causation
2.1 We search for a theory that will (at least) implicitly define the
concept of causation. Our goal is not the theory that is just contingently
true. A theory of causation must be analytically true and it must offer an
analysis of the concept of causation that must be true in all possible
worlds (not just in actual).
2.2 Hume, in the Treatise, famously offered consecutive pairs of
definitions of causation (Hume, 1975, 170)
2.3 The conclusion that we can derive from Hume's ideas is:
(i) causation is not directly observable
(ii) causation can not be a primitive relation between events
(iii) therefore, causation is reducible to some other items (in Hume's
case to the contiguity and precendency)
3. Basic features
3.1  A causal relation is any relation between states of affairs that is
irreflexive and asymmetric, which excludes loops, and which satisfies
the open sentence T.
3.2   Some relations between states of affairs are genuine relations.
3.3  No relation relates less than two particulars - no particulars can be
related to itself.
3.4  All genuine relations are necessarily irreflexive:
3.5 If a causal relation is not necessarily antysymmetric then there is no
distinction between a causal relation and nomic necessity.
3.51 Nomic necessitation:
      (i) it is a law that anything with property F also has property G. The
first thesis is compatible with: it is a law that anything with property G
has property F.
      (ii) If having property F is causally necessary for having property G,
it must be a law that whatever has property F has property G.
      (iii) If having F is causally sufficient for having G, it must be a law
that whatever has G also has F.
      (iv) If having F is both causally necessarily and causally sufficient 
for
having G, it must be a law that something has property F if and only if it
has property G.
      (v) Therefore, the relation of nomic necessitation cannot be
necessarily asymmetric.
3.52  Causation
There is a popular theory that defines causation as some sort of
"necessary connection.
3.521  Causal relation:
      (i) if SOA S causes SOA U it cannot be the case that U causes S.
      (ii)  causal relation is necessarily asymmetric.
3.522  Causal necessitation:
      (i) If having property F is a causally sufficient condition for having
property G, then having property G cannot be a causally sufficient
condition for having property F.
      (ii) If having F is causally sufficient condition for having G, then
having G is causally sufficient condition for F iff G is identical with F.
      (iii) causal necessitation is necessarily asymmetric.
If a relation R is a causal relation then it is asymmetric,
transitive and irreflexive.
3.6 Laws of nature and causality
Laws are second order state of affairs. They involve relations between
universals, which nomically necessitate corresponding statements
about first order particulars (SOA)
3.61  Causal laws are laws that involve causal relations.
3.62  Causal laws and necessary and sufficient conditions are global;
causal relation is local.
3.64  The existence of a causal relation does not by itself guarantee
the existence of a law.
3.65  Causal explanation subsumes SOAs (events) under the causal
relation.
3.66  Causal explanation (why) is not reduced to nomological
explanation (how).
4. Conclusion
If the singularist theory of causation is correct then it is logically
possible for there to be causally related SOAs that do no fall under any
law and it is possible to explicate the theory of causation without any
reference to laws of nature. However, it does not exclude the
possibility that there are laws of nature and singular causal relation
could be an instantiation of such a law.

A szeminaarium szervez'oje: E. Szaboo Laaszloo.

--
Laszlo E. Szabo
Department of Theoretical Physics
Department of History and Philosophy of Science
Eotvos University, Budapest
H-1518 Budapest, Pf. 32.
Phone/Fax: (36-1)372-2924
Home: (36-1) 200-7318
Mobil/SMS: (36) 20-366-1172
http://hps.elte.hu/~leszabo