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April 16, 2008

Call for Papers: Eastern Division APA

We are issuing a call for abstracts for the Eastern Division Meeting of
the Philosophy of Time Society on December 27-30, 2008, Philadelphia,
PA- Marriott Hotel. The deadline for submission is May 15, 2008 and
notification will occur on or before May 31, 2008. Please send your
abstract to Nathan Oaklander at lno@umflint.edu

December 04, 2007

Goedel told me so

    Since time is a physical quantity which can measured with fantastic accuracy, I've always taken it for granted.   By chance I ran across the PTS and it has introduced me to the many paradoxes inherent in time.  I have just read a book by Palle Yourgrau entitled "A World Without TIme: The Forgotten Legacy of Goedel and Einstein."  Kurt Goedel was perhaps  the greatest logician of the 20th century, if not of all time.  Goedel and Einstein became close friends in 1942 at the Princeton Institute for Advanced Studies.  Einstein taught Goedel general relativity.  Goedel developed a cosmology based on a rotating universe which was consistent with general relativity.  According to Yourgrau this consistency has never been dis-proven.  In Goedel's universe time was cyclical, hence it was possible to travel into the past.  Goedel concluded that the existence of time was inconsistent with general relativity.  To this day, this conclusion is either disbelieved or ignored.   Yourgrau states that "Rarely have so many understood so little about so much."  If one has the time(?), this book is well written and is a fun read for anyone interested in mathematical logic, physics, and the characters that once inhabited these domains.
    L J Swartzendruber

October 25, 2007

New bibliography

Check out the new on line bibliography for the philosophy of mind and consciousness studies at http://consc.net/mindpapers. There are two subsections listing lots of papers from philosophy and beyond on "temporal consciousness" and "time and consciousness."

This philosophy of mind site raises the question, perhaps we should put together our own group bibliography on time studies...

October 21, 2007

Truthmaker is a Goner

I've been reading Trenton Merricks' new book Truth and Ontology, and he spends the first few chapters beating up on Truthmaker.  I now think that Truthmaker is a goner.

"Truthmaker says that for every true claim there is something or other that - just by existing - makes that claim true" (p. 1).  If Truthmaker is true, then presentists who believe that propositions like D: that there were dinosaurs are true are in trouble because it seems that nothing presently exists to make (D) true.  Similar things could be said for propositions about brute dispositions, modal properties, subjunctive conditionals (including counterfactuals of freedom), and so on.  The principle motivation behind Truthmaker, Merricks points out, is to "catch the cheaters" - cheaters like presentists.More...

A big objection to Truthmaker is that negative existentials like H: that Hobbits don't exist don't need truthmakers but are true.  (H) is obviously true.  So Truthmaker is false.

Merricks devotes chapter 3 to dealing with ways that the Truthmaker theorist might try to account for the truths of negative existentials.  Perhaps the universe has the property of being such that there are no hobbits, and this property is the truthmaker for (H).  But then cheaters can make the same move.  They can say that the proposition (D) is made true by the universe's having the property of being such that there were dinosaurs.

Or perhaps (H) is made true by the totality of all existing objects in the universe.  But all this could exist and (H) could be false.  (It's possible that all existing objects in the universe exist and Hobbits exist as well.)

Perhaps (H) is made true by the totality of all existing objects in the universe and the universe's having the property being such that there is nothing else.  But then, as mentioned above, there doesn't seem to be a principled reason to disallow properties like being such that there were dinosaurs.

Merricks' response to that last objection is what did it for me.  Truthmaker theorists should move on to defending other principles like "truth supervenes on being" or they should formulate new principles.  But maybe my conclusion is to quick.  Is there any hope for Truthmaker?

October 15, 2007

Constituents of Times

Some people define a time as a maximally consistent set of propositions.  It seems to me that this is false because a set has its members essentially, but what is true at a time is only contingently true at that time.  (So that Bill walks to the store is the true at t, but it could have been false at t.)
But a bunch of smart people think of times as sets of propositions.  Consider:
Thomas Crisp:
"x is a time =df. For some class C of propositions such that C is maximal and consistent, x=[Ay(y is a member of C -> y is true]." ("Presentism and the Grounding Objection", Nous 41:1, 2007, p. 99)
(The "A" should stand for the universal quantifier.  In the article, Crisp cites Chisholm, Edward Zalta, Arthur Prior, Kit Fine, and Matthew Davidson as holding similar views.  Crisp's view strikes me as bizarre, since the only time that exists is the present time since that's the only one that's true.  But I bet I'm missing something really obvious.)
Ned Markosian
"There is the abstract present time, which is a maximal, consistent proposition.  There are many things that are similar to the abstract present time in being maximal, consistent propositions that either will be true, are true, or have been true.  Each one is a time.  The abstract present time is the only one of all of these abstract times that happens to be true now." ("A Defense of Presentism", Oxford Studies in Metaphysics 1, 2003, p. 76)
Robin Le Poidevin
"An instant, that is, is equated with all the propositions which would ordinarily be described as being (contingently) true at that instant.  The content of the propositions concerns the states of affairs taking place at that instant..." (Change, Cause, and Contradiction, 1991, p. 37)
(Here, Le Poidevin is referring to Prior's views, though he thinks that all presentists are committed to this definition.)
Craig Bourne
"I propose we construct times using maximally consistent sets of u-propositions, which intuitively we can see as those u-propositions that are true at that time." (A Future for Presentism, 2006, p. 53-54)
(By "u-proposition", Bourne is referring to a proposition without a past or future tense operator on it.)
The point that what is true at a time is contingent was pointed out by W.L. Craig in his critique of Le Poidevin's critique of presentism (A Tensed Theory of Time, p. 213), and Craig cites van Inwagen as noting this in his article "Indexicality and Actuality", 1980, footnote 3).
I think that Craig and Van Inwagen are right.  But doesn't this then make Crisp, Markosian, and Bourne's view of times implausible?

October 08, 2007

Are presentism/eternalism, etc. metaphysical or empirical claims?

Some claim that presentism is falsified by special relativity. Does that make presentism a contingent truth? If the speed of light were infinite, would that change matters for presentism? Do eternalism or the growing block theory, if true, have the status of metaphysical truth?

October 04, 2007

Eastern APA Meeting Papers

The paper Adrian Bardon will be presenting at the Eastern APA PTS meeting, "Kant and the Conventionality of Simultaneity," is available at the following link: bardon_simultaneity.doc

July 27, 2007

McTaggart Conference

April 25 and 26, 2008 West Virginia University will host "Time on Trial: One Hundred Years of McTaggart's Argument Against Time," a conference commemorating the anniversay of McTaggart's "The Unreality of Time." I'm pleased to announce we will have three outstanding keynote speakers: Nathan Oaklander, Quentin Smith, and Michael Tooley.

Quality submissions - 3,000 words - are also sought. They should be sent in blind review format to the email address below by November 1. The proceedings will be published in Philosophia.

Ernani Magalhaes (ernani.magalhaes@mail.wvu.edu)

May 05, 2007

McTaggart Anniversary

So next year is the 100th anniversary of the publication of "The Unreality of Time", which first introduced the notions of "A-series" and "B-series" to the philosophical literature. Is there anything being done to celebrate this? It seems like there should be some sort of conference on McTaggart's argument, considering it is arguably the most influential article in our field.

May 04, 2007

We Need a Chair and a Commentator for the Eastern APA

We need a chair for the group PTS meeting at the Eastern APA. We also need a commentator for Yuri Balashov's paper on coexistence. Please! Email me: ernani.magalhaes@mail.wvu.edu

May 02, 2007

Presentism and Special Relativity

I was once a presentist, but I have become convinced that special relativity makes presentism untenable. I would be interested in hearing what others have to say on this subject.

April 29, 2007

Temporal Relations

   Who thinks that ersatz B-relations provide an adequate solution to the so-called "problem of relations?" 

April 28, 2007

Eastern Division PTS Meetings

Ernâni Magalhães is going to comment on the paper by Adrian. If anyone is interested in commenting on Yuri's paper please contact me at lno@umflint.edu. Thanks. Nathan

Papers to be presented at the Eastern APA Meeting, December 2007, Baltimore, MD:

"Kant and the Conventionality of Simultaneity"

Adrian Bardon

Wake Forest University

www.wfu.edu/~bardona

Abstract:

Kant’s three Analogies of Experience, in his Critique of Pure Reason, represent a highly condensed attempt to establish the metaphysical foundations of Newtonian physics. His strategy is to show that the organization of experience in terms of a world of enduring substances undergoing mutual causal interaction is a necessary condition of the temporal ordering even of one’s own subjective states, and thus of coherent experience itself. In his Third Analogy—an examination of the necessary conditions of judgments of simultaneous existence—he argues that certain conceptual presuppositions consistent with Newtonian physics are necessary to time-awareness. His argument, however, appears to be undermined by conventionalism in natural science generally, and by the conventionality of simultaneity in particular. In this paper I discuss Kant’s claims in light of contemporary relativity theory. I suggest that, while his project is obsolete in major respects, there may still be useful insights into time-awareness to be drawn from his work.

"Against Alexandrov Present and Alexandrov Coexistence"

Yuri Balashov

University of Georgia

http://yuri.myweb.uga.edu

Abstract:

On eternalism, there is a sense in which all the inhabitants of spacetime coexist with each other, simply because all such entities—dinosaurs, Nebuchadnezzar, Jacques Chirac, etc.—exist, at their respective spacetime locations. But even the eternalist must admit that there is another sense of the coexistence relation such that she bears this relation to Chirac but not to Nebuchadnezzar. This sense of coexistence is familiar and important and its application is not limited to sentient beings. The Great Wall of China coexists, in this interesting sense, with the Taj Mahal, but there was a time when it did not. Can the interesting notion of coexistence be extrapolated to Minkowski spacetime? To the extent that this is possible it requires certain adjustments in the notion. The need to make the adjustments reveals two distinct strands in the "intuitive lore" of the coexistence relation. They work together in the classical setting but come apart in the relativistic context, thus giving rise to two different sets of rules associated with the use of the interesting concept of coexistence. Which of them, if any, can claim the title? I will consider the alternatives and defend my preferences.

A complete draft of Yuri's paper can be found at:

http://yuri.myweb.uga.edu/Working/coexistence_in_minkowski_spacetime.pdf

April 19, 2007

Call for abstracts--Metaphysics of Time

Richard Davies of the University of Bergamo (Italy) has announced a call for abstracts for the upcoming Metaphysics of Time conference in Bergamo, scheduled for September 6-8, 2007. For details, visit the conference website at www.unibg.it/metaphysics-of-time.

April 17, 2007

PTS Meeting Times

I would like to start a discussion about our current arrangements for meeting at the APA. My impression is that we invariably get stuck with the worst possible time slots (like Saturday evenings), which makes for rather low attendance at our talks. Why can't we get a different time slot, or at least have the APA rotate us with other societies that now meet at more attractive times?

Oxford Handbook on Time!

Craig Callender is editing the forthcoming Oxford Handbook on Time. Here is a preliminary list of contributors with preliminary chapter titles (in alphabetic order):

April 15, 2007

Welcome!

Welcome to the Philosophy of Time Society Forum. Members of the Society are invited to post messages and comment on posts. To join the Society click on the "join the PTS" link on the left.