Hello,
Could I ask that you remove me from your mailing list and from the Google Calendar reminders. Thank you very much, Annette Lüders From: [email protected] [mailto:[email protected]] On Behalf Of Google Calendar Sent: Sunday, 18 September 2011 1:00 PM To: Sydphil List Subject: [SydPhil] Reminder: Claudio Mazzola @ Mon 19 Sep 13:00 - 14:30 ([email protected]) <https://www.google.com/calendar/event?action=VIEW&eid=Xzg5Mms4ZTFnNm9zMzBiY TI3NHMzZ2I5azZjcTM2YjlvNmwxajZiOWk2OHBqZ2Uxbzhjb2plaGE2NzQgZmV2MWxkcjRsa2h2M DM2b2U0aW4yanR0ZGdAZw> more details » Claudio Mazzola Time-Reversal Invariance Is Not Invariance under a Reversal of Time Time-reversal invariance is a central notion to contemporary philosophy of time. In accordance with the standard interpretation, a physical theory is time-reversal invariant just in case, for every sequence of states which is compatible with its laws, the sequence obtained by reversing the order of the images of those states as of an appropriate time-reversal operator is also compatible with those laws. Time-reversal invariant theories are usually taken to be insensitive to the chosen orientation of time, and hence to carry positive evidence in favor of the symmetry of time itself. Moving from some recent results in dynamical systems theory, I offer a critical examination of time-reversal invariance, as just defined. In particular, I show that its meaning varies depending on the algebraic structure which is chosen to model physical time and that, as a consequence, time-reversal invariant theories become insensitive to the chosen orientation of time just in case the assumed time model is a commutative group. Commutative groups, on the other hand, are themselves highly symmetric structures. In consequence, the usual understanding of time-reversal invariance becomes exposed to some major drawbacks. When Mon 19 Sep 13:00 14:30 Eastern Time - Melbourne, Sydney Where Room 422, University of Sydney, Main Quad ( <http://maps.google.com.au/maps?q=Room+422,+University+of+Sydney,+Main+Quad&; hl=en-GB> map) Calendar [email protected] Who [email protected] <mailto:[email protected]> - creator Invitation from Google Calendar <https://www.google.com/calendar/> You are receiving this email at the account [email protected] because you set a reminder for this event on the calendar [email protected]. You can change your reminders for specific events in the event details page in https://www.google.com/calendar/.
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