TF Lunch meetings
Lunch meetings 2004
We meet on a weekly basis.
Normally we work in an informal setting (some speak while others eat).
Plaats: Bestuursgebouw 195
Datum: Dinsdag 6 januari
Tijd: 12:00-13:00
Titel: Modal matters in Interpretability logics; deel 2
Spreker: Joost J. Joosten
Het abstract is ongewijzigd. In deel twee zullen we iets meer
op technische details ingaan.
Abstract
In deze voordracht zullen we ons concentreren op de modale
semantiek van interpreteerbaarheidslogicas. We presenteren een
constructiemethode waarmee van een groot aantal logicas de
modale volledigheid kan worden bewezen. Tevens kunnen we deze
methode aanwenden om een aantal belangwekkende arithmetische resultaten
te verkrijgen.
In samenwerking met Evan Goris
Plaats: Bestuursgebouw 195
Datum: Dinsdag 13 januari
Tijd: 12:00-13:00
Titel: De rol van ergodentheorie in de filosofie van de statistische fysica
Spreker: Janneke van Lith
Tuesday January 20, Professor Tait from the University of Chicago, will
give a talk in the Tf lunch series of the philosophy department.
Speaker: William W. Tait
Title: Are there intuitionistic counterexamples to classical mathematical
logic?
Place: University of Utrecht, Uithof, Bestuursgebouw 036
Date: Tuesday January 20, 2004
Time: 11:00-13:00
Note that we start at 11:00 and not at the usual 12:00.
More information on how to get at the Uithof can be found
here.
Plaats: Bestuursgebouw 195
Datum: Dinsdag 27 januari
Tijd: 12:00-13:00
Titel:INDUCTION IN THE CATEGORY OF INTERPRETATIONS
Spreker: Albert Visser
As is well known, the principle of induction can be viewed as a consequence of
the fact that the natural numbers form a free algebra. This insight
is reflected in the category of interpretations. An interpretation of
a weak arithmetic satisfies full induction if it is initial in
a certain sense. We explain this idea in some detail and discuss some
consequences.
Plaats: Bestuursgebouw, 048
Datum: Dinsdag 3 februari
Tijd: 12:00-13:00
Titel: Het hypothetisch oordeel bij Brouwer
Spreker:John Kuiper
De bewijsinterpretatie van de intuitionistische wiskunde en logica is
niet vanaf het begin de ons nu bekende geweest.
In zijn dissertatie stelde Brouwer zeer strenge eisen aan het
hypothetisch oordeel, veel strenger dan Kolmogorov en Heyting dat
deden (hoewel er bij de eerste ook een wijziging optrad in zijn
opvattingen).
Later accepteerde Brouwer impliciet Heytings interpretatie.
Plaats: Bestuursgebouw 038
Datum: Dinsdag 10 februari
Tijd: 12:00-13:00
Titel:INDUCTION IN THE CATEGORY OF INTERPRETATIONS, part 2
Spreker: Albert Visser
The abstract has not been changed. In the second part we will
focus more on proofs.
As is well known, the principle of induction can be viewed as a consequence of
the fact that the natural numbers form a free algebra. This insight
is reflected in the category of interpretations. An interpretation of
a weak arithmetic satisfies full induction if it is initial in
a certain sense. We explain this idea in some detail and discuss some
consequences.
Plaats: Bestuursgebouw 038
Datum: Dinsdag 17 februari
Tijd: 12:00-13:00
Titel: Procesalgebras in hybride systemen
Spreker: Jan Bergstra
Joint work with Cees Middelburg.
Plaats: Bestuursgebouw 038
Datum: Dinsdag 24 februari
Tijd: 12:00-13:00
Titel: Limit existence principles in arithmetic and related topics
Spreker: Lev D. Beklemishev
Abstract:
We study the principle asserting that a primitive recursive function
that is eventually weakly decreasing is eventually constant and some
other principles
of similar flavour in PA. We discuss some applications of such
principles
to interpretability and conservativity logic.
Plaats: Bestuursgebouw 036
Datum: Dinsdag 2 maart
Tijd: 12:00-13:00
Titel: Indirect Speech Acts, Politeness, and the Civilizing Process
Spreker: Herman Hendriks
Abstract:
I will argue that Levinson's (1983) conversation analysis
of linguistic indirectness is superior to an account in
terms of speech act theory along the lines of Searle (1979b),
especially in view of the way in which it relies on
Brown and Levinson's (1987) theory of politeness as an
explanatory mechanism. In a critical examination of their
own work, Brown and Levinson conclude that their analysis of
politeness suffers from an "overdose of cognitivism", as a
result of which it is not able to account for the fact that
social interaction has its own emergent properties which
transcend the characteristics of the individuals that jointly
produce it. Most notably, the phenomenon of politeness is
linked up with the concept of aggression, and, among other
notions that are central to the nature of the social persona,
with the concept of embarrassment. The tenet of the present
paper is that this emergent character of social interaction
can be accounted for if the study of its internal systematics
is supplemented with the theory of the development of social
structure that has been proposed within the framework of the
historical sociology of Elias (1993).
Plaats: Bestuursgebouw 048
Datum: Dinsdag 9 maart
Tijd: 12:00-13:00
Titel: Burned chips and indianenverhalen
Spreker: Joop Leo
Abstract:
Chips can become quite hot if a lot of wires switch from 0 to
1 and visa versa in a short time. For a certain class of logical
circuits I will show that they are real energy-eaters. Further, I will
discuss a relation between information complexity and energy
consumption in chips. This relation, which is of a rather general kind,
also gives some insight in the effort needed to communicate massages
with a tam-tam in a certain time.
In Dutch:
Titel: Aangebrande chips en indianenverhalen
Chips kunnen behoorlijk warm worden als veel draadjes in
korte tijd vaak switchen van 0 naar 1 en omgekeerd. Van een bepaalde
klasse van logische circuits zal ik laten zien dat het echte
energievreters zijn. Verder wil ik een verband tussen
informatiecomplexiteit en energieverbruik in chips bespreken. Dit
verband is van vrij algemene aard en geeft ook inzicht in de inspanning
die nodig is om berichten binnen een bepaalde tijd door te geven met de
tamtam.
Speaker: Mojtaba Aghaei
Title: Basic propositional logic, its systems and its models
Place: University of Utrecht, Uithof, Bestuursgebouw 038
Date: Tuesday March 16, 2004
Time: 12:00-13:00
Basic propositional logic was first introduced by A. Visser in 1981,
by the intention of formalizing provability. Formal provability logic
is related to the provability modal logic GL just as intuitionistic
logic is related to modal logic S4. Basic logic itself is related to
K4. It is sound and complete with respect to the class of transitive
Kripke models.
In this lecture we introduce basic propositional logic and its
motivation, and review its different axiomatic systems and its Kripke
and algebraic models.
Speaker: Mojtaba Aghaei
Title: Basic predicate logic, its proof theory and its arithmetic
Place: University of Utrecht, Uithof, Bestuursgebouw 036
Date: Tuesday March 23, 2004
Time: 12:00-13:00
Basic Predicate Calculus, BQC, was first introduced by W. Ruitenburg in
1990. He axiomatized it in sequent notation and his motivation came
from a philosophical criticism of the BHK (Brouwer-Heyting-Kolmogorov)
interpretation of the logical connectives.
In this lecture we introduce the axiomatic systems of BQC, basic
arithmetic BA, and its realizablity.
Speaker: Marta Bilkova
Title: On Computational Content of Intuitionistic Proofs
Place: University of Utrecht, Uithof, Bestuursgebouw 036
Date: Tuesday March 30, 2004
Time: 12:00-13:00
Abstract:
I follow up work of P. Pudlak and S Buss on feasibility of the disjunction
property in IPC trying to do without the cut elimination theorem.
My aim is to realize intuitionistically provable sequents by (in some
cases) poly-time computations that can be constructed from a given proof
in time polynomial in the size of this proof.
In my talk I will start with an easy fragment of IPC containing only
conjunction, disjunction, and negation and outline how this can work
admitting more complex implications.
Speaker: Albert Visser
Title: object-theory and meta-theory
or
Title: direct interpretations and discrete fibrations
Place: University of Utrecht, Uithof, Bestuursgebouw 038
Date: Tuesday April 6, 2004
Time: 12:00-13:00
At least one of the topics will be discussed.
From April 13 on, we will have our meetings, unless mentioned otherwise,
in room 195.
Speaker: No one yet
Title:
Place:
Date: Tuesday April 6, 2004
Time: 12:00-13:00
(...)
Speaker: Vincent van Oostrom
Title: reduction- vs stack-based read-back
Place: University of Utrecht, Uithof, Bestuursgebouw 195
Date: Tuesday April 20, 2004
Time: 12:00-13:00
Abstract:
The read-back problem is the problem to read back a term from a graph,
in a graph implementation of term rewriting.
The problem is easy to solve in the first-order case, but hard in the
higher-order case.
We present a simple reduction-based solution for the higher-order
read-back problem.
Although this yields a very simple implementation, the correctness
proof of the algorithm is not easy; it is based on a complex stack-based
solution to the read-back problem.
We present both read-back procedures and relate them.
Speaker: Herman Hendriks
Title: Indirect Speech Acts, Politeness, and the Civilizing Process, part 2
Place: University of Utrecht, Uithof, Bestuursgebouw 195
Date: Tuesday April 26, 2004
Time: 12:00-13:00
I will argue that Levinson's (1983) conversation analysis
of linguistic indirectness is superior to an account in
terms of speech act theory along the lines of Searle (1979b),
especially in view of the way in which it relies on
Brown and Levinson's (1987) theory of politeness as an
explanatory mechanism. In a critical examination of their
own work, Brown and Levinson conclude that their analysis of
politeness suffers from an "overdose of cognitivism", as a
result of which it is not able to account for the fact that
social interaction has its own emergent properties which
transcend the characteristics of the individuals that jointly
produce it. Most notably, the phenomenon of politeness is
linked up with the concept of aggression, and, among other
notions that are central to the nature of the social persona,
with the concept of embarrassment. The tenet of the present
paper is that this emergent character of social interaction
can be accounted for if the study of its internal systematics
is supplemented with the theory of the development of social
structure that has been proposed within the framework of the
historical sociology of Elias (1993).
Speaker: Menno Lievers
Title: Last Minute Talk
Place: University of Utrecht, Uithof, Bestuursgebouw 195
Date: Tuesday May 4, 2004
Time: 12:00-13:00
Speaker: Menno Lievers
Title: The justification of the generality constraint
Place: University of Utrecht, Uithof, Bestuursgebouw 195
Date: Tuesday May 10, 2004
Time: 12:00-13:00
| | Tuesday May 18 |
Speaker: Joost J. Joosten
Title: Models for GLP; Counting up to ε0
Place: University of Utrecht, Uithof, Bestuursgebouw 195
Date: Tuesday , 2004
Time: 12:00-13:00
Abstract: In this talk I will present some "results/insights" obtained during my
stay at Steklov institute. The work is not yet finished and many statements still are
in need of rigorous proofs. The presented work is
in colaboration with Lev D. Beklemishev.
It is difficult to provide GLP with a natural Kripke semantics, yet GlP is a very
natural and useful logic. It contains a hierarchy of strength-increasing
proof predicates. The logic has proven a fruitful tool in the study of
natural ordinal notation systems and in providing independent combinatorial
principles. Some tricks have been developed to surmount the impossibility of
a natural Kripke semantics for GLP. We shall present a semantics invented by
Ignatiev for the closed fragment and pronounce a hope that, by restricting the
possible valuations, this universal model can also be used to give GLP semantics.
The model turns out to be deep, rather deep. Actually very deep,
namely ε0-deep. However, we would like to have properties of the model
provable inside theories that can not see the well foundedness of orderings
ε0.
This calls for finite approximations using a Norm-function on ordinals.
Speaker: Joost J. Joosten
Title: Models for GLP; Counting up to є0, part 2: almost there
Place: University of Utrecht, Uithof, Bestuursgebouw 195
Date: Tuesday , 2004
Time: 12:30-13:30
Abstract: unchanged.
Speaker: Marta Bilkova
Title: A proof-theoretic proof of uniform interpolation of the modal
logic K
Place: University of Utrecht, Uithof, Bestuursgebouw 195
Date: Tuesday , 2004
Time: 12:00-13:00
Abstract:
I'm going to present a proof theoretic proof of uniform interpolation for
the modal
propositional logic K based on Pitts' proof for intuitionistic
propositional logic. The proof uses a simulation of
quantifiers over propositional variables and a terminating sequent
calculus for which structural rules are admissible.
Plaats: Bestuursgebouw 195
Datum: Dinsdag 8 juni
Tijd: 12:00-13:00
Titel: FD a la Mellies
Spreker: Vinvent van Oostrom
For a given term t, a development of a set of redexes T in t
is a sequence of reduction steps from t in which only residuals
of redexes in T may be contracted (so no created redexes).
The Finite Developments Theorem (FD) expresses that all
developments are finite. Intuitively this holds because
only existing redexes may be contracted and since
we only start with a finite supply (T) of them, we will
eventually run out of redexes to contract.
A complication is that (residuals of) redexes may replicate one another.
Mellies has introduced some abstract conditions guaranteeing
that replication does not get out of hand, of which we present
a version in the concrete setting of second-order rewriting.
Plaats: Bestuursgebouw 195
Datum: Dinsdag 15 juni
Tijd: 12:00-13:00
Titel: Towards a Game-theoretical Notion of Consequence
Spreker: Paul Harrenstein
Von Neumann and Morgenstern presented game-theory as a branch of
mathematics that deals with problems that had nowhere been dealt with
before. From a mathematical point of view, the participants in a
situation of conflict can be seen as each trying to maximize the same
function (the outcome of the game) according to an idiosyncratic
principle (their preferences).
Moreover, none of the players have control over all variables of the
function. The also argued that the usual notion of optimality is no
longer available and new solution concepts had to be developed to
take its place. Most notably among these game-theoretical solution
concepts is still that of a Nash-equilibirum.
Logical notions of consequence have frequently been related to
game-theoretical solution concepts. The correspondence between a
formula being classically valid and the existence of a winning
strategy for a player in a related two-person game, has been most
prominent in this context. We propose a conservative extension of the
classical notion of consequence for propositional logic based on a
generalization of
Nash-equilibrium.
We construe propositional variables as decision variables that are
possibly in the control of various agents and pursue the logical
consequences of this idea. The game-theoretical concept of
consequence that results opens up a line of theoretical research
in which logic, game theory and social choice theory interact at
the same level.
Plaats: Bestuursgebouw 195
Datum: Dinsdag 22 juni
Tijd: 12:00-13:00
Titel: Measuring Theories
Spreker: Albert Visser
One way of comparing objects is by assigning simpler objects to the
given objects. The simple objects will be comparable in some familiar way.
The simpler objects may be real numbers, groups, ...
We compare theories by assigning certain extensions of a
weak theory to the given theories. The assigned theories are compared
via the subset ordering. Our way of proceeding is a modification of
the familiar notion of consistency strength. We will explain why
our notion is *extensional*, where consistency strength is
*intensional*.
It turns out that for a wide class of theories our notion coincides with
local interpretability.
| | Dinsdag |
Plaats: Bestuursgebouw 195
Datum: Dinsdag 29 juni
Tijd: 12:00-13:00
Titel: Recursive sets and N-labelled graphs
Spreker: Jaap van Oosten
Abstract: We shall present a combinatorial
problem concerning these things, and explain the
relevance of it.
Plaats: Bestuursgebouw 195
Datum: Dinsdag 14 September
Tijd: 13:00-14:00
Titel: Two topics from my thesis
Spreker: Joost J. Joosten
Abstract:
This talk consists of two parts. In the first part we will study
Beklemishevs approach to natural ordinal notation systems. His approach is
based on graded provability algebras and makes extensively use of closed
modal formulae. We shall focus on the universal model of the closed
fragment of GLP; a modal semantics of depth $\epsilon_0$.
The second part of the talk is devoted to relativized interpretability as a
tool for proof-strength comparison. Our main interest will be in the
calculation of interpretability logics.
In rough lines, I will present this talk on Saturday September 18
in Heidelberg:
http://math.uni-heidelberg.de/logic/CL_2004/
Plaats: Bestuursgebouw 195
Datum: Dinsdag 19 october
Tijd: 12:00-13:00
Titel: Realizability and Propositional Logic
Spreker: Albert Visser
This talk is a report on the project "Realizability and Propositional Logic"
of
Jaap van Oosten, Rosalie Iemhoff & Albert Visser. Kleene Realizability is
one of the
possible `metamathematifications' of the Brouwer-Heyting-Kolmogorov
Explanation
of the logical connectives. In spirit it is closely connected to the tenets
of the Markov
school: ( All Mathematical Objects are Finite ) & ( Effective = Turing
Computable ).
The question adressed in the project, is the simpe question:
What is the propositional
logic of realizability?
Most of the talk will be devoted to getting the various possible
explications
of the question on the board.
We will present some of the more startling results of the field concerning
the
explosive marriage of Church's Thesis (CT) and Markov's Principle (MP), to
wit:
1) the predicate logic of suitable theories containing (CT+MP) is complete
\Pi^0_2;
2) the propositional logic of suitable theories containing (CT+MP) is more
than
Intuitionisitic Propositional Logic (IPC)
Plaats: Bestuursgebouw 195
Datum: Dinsdag 26 october
Tijd: 12:00-13:00
Titel: Menno over Lyn Rudder Baker
Spreker: Menno Lievers
Abstract:
Lynne Rudder Baker betoogt in haar artikel "Persons and Other Things" dat er
geen essentieel onderscheid is tussen artefacten, zoals koffiekopjes en
stoelen, en substanties, zoals koeien en bloemen. In beide soorten van
objecten speelt volgens haar constitutie eenzelfde rol. Dit geldt ook voor
mensen, maar in dat geval dient de notie van constitutie ook om een cruciaal
onderscheid te maken tussen personen en hun lichaam. Mijn kritiek is
tweeledig: ten eerste dat er wel degelijk een essentieel onderscheid bestaat
tussen artefacten en substanties; ten tweede dat er geen essentieel
onderscheid bestaat tussen personen en hun lichaam.
Plaats: Bestuursgebouw 195
Datum: Dinsdag 2 november
Tijd: 12:00-13:00
Titel: An informal introduction to Logic in Law
Spreker:Lev Beklemishev
An informal introduction to Logic in Law
Speaker: Henry Prakken
Title: Logic and dialogue in legal reasoning: an
inevitable intertwining
Place: University of Utrecht, Uithof, Bestuursgebouw 195
Date: Tuesday , 2004
Time: 12:00-13:00
Legal Reasoning is inherently defeasible, and it often takes place in an adversarial setting. I will argue
that these two aspects of legal reasoning are inevitably intertwined, so that logical accounts of legal
reasoning cannot separate inferential from dialogical aspects.
Speaker: Andrey Bovykin
Title: Independent arithmetical statements: present and future
Place: University of Utrecht, Uithof, Bestuursgebouw 195
Date: Tuesday November 16, 2004
Time: 12:00-12:30
Speaker: Lorenzo Carlucci
Title: U-shaped learning may be necessary
Place: University of Utrecht, Uithof, Bestuursgebouw 195
Date: Tuesday November 16, 2004
Time: 12:30-13:00
Abstract
Lorenzo Carlucci (University of Siena, University of Delaware)
Abstract Andrey Bovykin (St.Petersburg Department of Steklov Mathematical Institute,
and The University of Liverpool):
This is a "popular mathematics" talk that will
introduce independence results to a general audience
(and remind logicians of what they may already know).
I shall sketch a very simple proof of unprovability of
an adapted version of the Paris-Harrington Principle,
quote some new developments and give a glimpse of the near future of
the subject as I see it: what we are now able to do
and what we should try to accomplish.
Plaats: Bestuursgebouw 048
Datum: Dinsdag 23 november
Tijd: 13:00-14:00
Titel: Wijsgerige Ethiek
Spreker: Marcus Duewell
Dit is de eerste aflevering in de serie F-lunches.
Doel: kennis nemen van de inhoud van vakken uit het eerste jaar van de studie
wijsbegeerte en suggesties bespreken over meer onderlinge verwijzingen en
coherentie in het onderwijsaanbod.
Vorm: +-45 minuten, een spreker, de toehoorders gebruiken de lunch, dit eens
per maand.
Plaats: Bestuursgebouw 195
Datum: Dinsdag 7 December
Tijd: 12:00-13:00
Titel: Qualia overboord? Een analyse van het qualiabegrip in Dennett's "Quining
Qualia.".
Spreker: Janne Willems
In zijn artikel "Quining Qualia" uit 1990 betoogt Dennett dat 'qualia' een
ondefinieerbaar begrip is en dat het niets toevoegt aan bewuste ervaring.
Dit begrip kan daarom het beste verdwijnen. In mijn lezing zal ik ingaan
op manier waarop Dennett het begrip 'Qualia' in dit artikel hanteert. Ik
beargumenteer dat Dennett verstrikt lijkt te raken in zijn eigen gebruik
van het begrip 'qualia'. Zo schrijft hij eigenschappen aan het begrip
'qualia' toe die hij volgens zijn definitie niet aan dit concept mag
toekennen en gebruikt hij in zijn argumentatie twee definities van het
begrip 'qualia', waar hij zegt dat hij er een gebruikt.
Speaker: Michael Moortgat
Title: Arrow reversal in categorial grammar
Place: University of Utrecht, Uithof, Bestuursgebouw 195
Date: Tuesday December 14, 2004
Time: 12:00-13:00
Abstract:
The aim of categorial grammar is to identify the invariant
principles that govern the correspondence between form and
meaning, and to obtain language diversity throught the
interaction of these invariants with a restricted set of
non-logical axioms, or structural postulates.
Since the introduction of the framework in 1958, invariants
have been discussed in terms of residuated families of
logical constants/type-forming operations. This restriction
of the logical vocabulary makes that core phenomena of
natural language syntax and semantics require the introduction
of non-logical axioms--clearly an undesirable situation.
We show that by broadening the vocabulary, we can bring
such phenomena within the reach of the invariant core logic.
We illustrate with scope construal of generalized quantifiers
and related phenomena, which we analyse in terms of
*dual* residuated families (cotensor, co-implications).
Plaats: Bestuursgebouw 195
Datum: Dinsdag 21 december
Tijd: 12:00-13:00
Titel: Geschiedenis I
Spreker: Teun Tieleman
Aflevering twee van de F-lunch.
Het is de bedoeling om zelf lunch mee te brengen.
Indien mogelijk zullen we de bijeenkomst in BG 048 houden. In dit geval
zal ik dinsdag ochtend nog een mailtje sturen.
Speaker: Thomas Dohmen
Title: Context and Error in the Epistemology of Scientific Experiment
Place: University of Utrecht, Uithof, Bestuursgebouw 195
Date: Tuesday January 4, 2005
Time: 12:00-13:00
Within traditional epistemology, so-called skeptical scenarios challenge
the idea of having knowledge. These scenarios demand a level of
justification which has to be delivered in order to call something
knowledge that is impossible to reach. A way to deal with these
skeptical scenarios is offered by an approach called contextualism, in
which it seems reasonable to disregard skeptical scenarios in certain
contexts, thereby justifying the attribution of knowledge in those
constrained contexts.
The project of Generating Experimental Knowledge investigates the
critical role of error in experimental science. Scientists use experiments
to generate knowledge. They rely on various standard methods to insure
that the experiment provides them with correct data. By relying on these
methods, scientists seem to be justified in attributing knowledge to the
theories that have been confirmed by experiments or to theories that
follow the outcome of experiments, although possible errors have not been
(individually) accounted for.
The claim of this part of the project is that, by referring to such
standard methods, scientists create a context of justification which
enables them to attribute knowledge in the same way that the epistemic
contextualists create a context of justification. This is done by creating
a context in which knowledge can be justifiably attributed without
regarding the factors that threaten this attribution of knowledge to the
full extent. In contextual epistemology, there is no full defense against
skeptical scenarios (these scenarios are just properly ignored in most
contexts), and in scientific experiment not every possible error is
individually accounted for (because there is a reference to a context of
similar and related experiments and standard methodologies, some
possible errors are ignored).
This PhD thesis suggests and presents an analogical relation between
skepticism in the theory of knowledge and error in the practice of
experimental science. It is an investigation into both the consequences of
the concept of knowledge and epistemic skepticism for the practice of
experimental science and the consequences of error in experimental science
for the theory of knowledge. The main focus is on the role of context in
both fields of study, since it is supposed that context determines when
knowledge can be correctly attributed in both fields.
This thesis will offer not only an evaluating overview of the debates of
the last two decades of contextual epistemology, but will also contribute
a specific perspective on the practice of experimental science from
epistemic theory, thereby offering a practical case to matters that
traditionally have always remained highly theoretical. Conversely, it
will offer a deeply philosophical background of the concept of scientific
knowledge to the practice of scientific experimentation (which is
generally thought to generate knowledge). Furthermore, the thesis will
include an extensive account of the semantic issues arising through a
contextual approach to science and its related conceptual terminology. It
is hoped that, together, these analyses will lead to a better
understanding of the relationship between the theory of knowledge
(epistemology) and the attribution of knowledge in experimental science.
Speaker: Cory Wright
Title: Minimalist explanations do not explain very much
Place: University of Utrecht, Uithof, Bestuursgebouw 195
Date: Tuesday January 11, 2005
Time: 12:00-13:00
Abstract:
Minimalist explanations of truth dont explain very much---and thats
fine, so long as theres little in need of explanation in the first place;
but that itself cannot be a reason for thinking that truth is not a robust
alethic phenomenon. So minimalists need a second-order explanation as to
why minimal explanations are adequate. Over the last 15 years, Paul
Horwich has provided and defended just such an explanation, and, in doing
so, has provided one of the most serious challenges to the legitimacy of
substantive theoriesone which is all the more powerful given that it does
not discriminate amongst them. Consequently, Horwichs alethic minimalism
is one of the bigger obstacles to the plausibility of substantive alethic
theories. In this talk, I consider reasons for looking askance at
Horwichs explanation as to the adequacy of minimal explanations should be
rejected, which---if gripping---would suggest that minimalism is not the
threat to substantivism that it is so often held to be.
Plaats: Ruppert Rood (let op: afwijkende plaats!)
Datum: Dinsdag 18 januari, 2005
Tijd: 12:00-13:00 (let op: afwijkende afwijkende tijd = normale tijd)
Titel: Logica 1
Spreker: Joost J. Joosten
Aflevering drie van de F-lunch.
Het is de bedoeling om zelf lunch mee te brengen.
Speaker: Tanja Yavorski
Title: Operations on proofs and labels.
Place: University of Utrecht, Uithof, Bestuursgebouw 195
Date: Tuesday January 25, 2005
Time: 12:00-13:00
Abstract:
This talk is about the logic of proofs (S.Artemov, 1997), the ongoing research in this field and,
in particularly, about logic of proofs as a framework for specification of operations on proofs.
Logic of proofs is formulated in the propositional language enriched by the proof predicate "t is
a proof of F". We add a new labelling predicate "x is a label for F" to the language. This enables
one to specify a wide class of operations which produce codes of proofs being given codes of some
other proofs and possibly codes of formulas. We describe logics which specify different opertions
on proofs and labels. The main result is the uniform completeness theorem for these logics.
Speaker: Rostik Yavorski
Title: On the first order logic of the standard proof predicate
Place: University of Utrecht, Uithof, Bestuursgebouw 195
Date: Tuesday February 1, 2005
Time: 12:00-13:00
Abstract:
There are two ways to consider first order extensions of the logic of
proofs LP. First, we can extend the set of atomic formulas by adding
predicate letters, individual variables etc. The second way is to
extend the language of LP with quantifiers on proofs.
In my talk I will report recent results in this field.
In particular, I will focus on the properties of the first order logics
corresponding to the standard (single conclusion) Goedel proof predicate
and its multiple conclusion modification.
Plaats: Bestuursgebouw 036
Datum: Dinsdag 8 februari 2005
Tijd: 12:00-13:00
Titel: Filosofie van de Geest
Spreker: Joel Anderson
Aflevering vier van de F-lunch.
Het is de bedoeling om zelf lunch mee te brengen.
Speaker: Siewert van Otterloo
Title: Game and Preference Logics
Place: University of Utrecht, Uithof, Bestuursgebouw 195
Date: Tuesday February 15, 2005
Time: 12:00-13:00
Abstract:
Several attempts have been made to develop logical languages for reasoning
about games. Many of these logics are variants of propositional modal
logic, with extra operators that address game theoretic issues, such as
time, actions, preferences and outcomes. In my talk I will compare several
of these logics, and explain what properties make these logics useful or
interesting to look at. I will do this from both a philosophical and a
computer science perspective.
There exists a mailing list for the lunch meetings. If you are interested in signing up,
or if you have any suggestions or comments, please contact me.
Joost Joosten
Last modified: Fri Jan 28 15:36:44 MET 2005