<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div data-marker="__QUOTED_TEXT__"><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;">Dear all,</div><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;"><br></div><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;">Please see below registration informations and further details of my perviously pre-advertised workshop with respondents.</div><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;">Topic: Symmetries in philosophy of physics and science.</div><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;">Date and place: Thursday 1st June 2023, online.</div><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;"><br></div><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;">Looking forward to seeing some of you there,</div><br><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;">Valeriya Chasova</div><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;"><br></div><div>https://valeriyachasova.xyz/</div><br><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;">===</div><br><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;"><strong>1st June 2023 - Symmetry workshop (online, with respondents)</strong></div><br><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;"><em><strong>Organised by Valeriya Chasova</strong> (CEFISES, UCLouvain / AHP-PReST, UniStra).</em></div><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;"><i>Practical details are planned to be communicated around 1-2 days in advance of the workshop, upon registering at vchasova@unistra.fr for those who I have not promised them yet. When writing me tell of yourself and your motivation if I do not know you. Please note that due to a high number of letters it is not always possible to reply everyone individually.</i></div><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;"><i><br></i></div><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;"><i>Time zones with respect to UTC: California PDT(-8+1) / Great Lakes EDT(-5+1) / British Isles WEST(0+1) / Central Europe CEST(+1+1).</i></div><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;"><i>In case of time discrepancies (errors) in the programme the time in Austria is decisive.</i><em style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;"></em><em></em></div><br><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;"><span style="text-decoration: underline;">Programme</span></div><br><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;">05/08/13/14h00 <strong>Jill North</strong> (Rutgers University), <em><strong>On the Idea of Perspicuous Representations (and Symmetries)</strong></em> - <em>Respondent:</em> <strong>Sebastian De Haro</strong> (UvA)</div><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;">06/09/14/15h00 <strong>Alison Fernandes</strong> (TCD), <em><strong>How to Explain the Direction of Time</strong></em> - <em>Respondent:</em> <strong>Cristian López</strong> (University of Lausanne)</div><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;">07/10/15/16h00 <em>Break 15 min.</em></div><br><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;">07/10/15/16h15 <strong>David Baker</strong> (University of Michigan), <em><strong>The Epiphenomena Argument for Symmetry-to-Reality Inference</strong></em> - <em>Respondent:</em> <strong>David Wallace</strong> (University of Pittsburgh)</div><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;">08/11/16/17h15 <em>Break 45 min.</em></div><br><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;">09/12/17/18h00 <strong>David Wallace</strong> (University of Pittsburgh), <em><strong>Isolated Systems and their Symmetries</strong></em> - <em>Respondent:</em> <strong>Valeriya Chasova</strong> (CEFISES, UCLouvain / AHP-PReST, UniStra)</div><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;">10/13/18/19h00 <strong>Valeriya Chasova</strong> (CEFISES, UCLouvain / AHP-PReST, UniStra), <em><strong>Observable Diffeomorphisms (or, How to Limit the Hole Argument and Extend Direct Empirical Status)</strong></em> - <em>Respondent:</em> <strong>John Dougherty</strong> (MCMP, LMU Munich)</div><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;">11/14/19/20h00 <em>Break 15 min.</em></div><br><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;">11/14/19/20h15 <strong>JB Manchak</strong> (UCI) (<em>joint work with Thomas Barrett</em>), <em><strong>A Hierarchy of Spacetime Symmetries: Holes to Heraclitus</strong></em> - <em>Respondent:</em> <strong>Bryan Roberts</strong> (LSE)</div><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;">12/15/20/21h15 <em>End</em></div><br><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;"><span style="text-decoration: underline;">Abstracts</span></div><br><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;"><strong>Jill North, <em>On the Idea of Perspicuous Representations (and Symmetries)</em></strong></div><br><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;">There are in general many different ways of representing something. Some of these ways can be better or more perspicuous than others. I argue that perspicuous representations are such not for pragmatic or subjective reasons, but for objective, intrinsic ones. For example, one way for a representation to be more perspicuous is for it to more directly represent the symmetries of the entity being represented. One consequence I will discuss: there is an interesting sense in which representations or theoretical formulations differing (only) in their level of perspicuity can be regarded as inequivalent.</div><br><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;"><strong>Alison Fernandes, <em>How to Explain the Direction of Time</em></strong></div><br><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;">Reichenbach explains the direction of time and other temporal asymmetries using entropy and ‘branch structure’. There is a direction of time because our universe is currently on a long entropic upgrade, and subsystems branch off and become quasi-isolated. This direction is manifest to us in a range of features, including an asymmetry of records. Reichenbach’s explanation of the record asymmetry has been criticised for its reliance on entropy. More generally, Reichenbach’s approach has been neglected in favour of those that appeal to a particular low entropy initial state (the Past Hypothesis). I argue that this neglect is unwarranted. Reichenbach’s approach has important advantages: it correctly identifies the difference-maker that accounts for temporal asymmetries, it considers the conditions required for asymmetries to be manifest, and it identifies a local inferential mechanism that applies towards the past and not towards the future. While Reichenbach’s account needs to be supplemented in various ways, it provides a better starting point than alternatives for understanding the necessary conditions for a direction of time and its manifestation.</div><br><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;"><strong>David Baker, <em>The Epiphenomena Argument for Symmetry-to-Reality Inference</em></strong></div><br><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;">A new argument is given for the thesis that only symmetry-invariant physical quantities are real. Non-invariant quantities are dynamically epiphenomenal in that they have no effect on the evolution of invariant quantities, and it is a significant theoretical vice to posit epiphenomenal quantities. This view fits within the more general "redundancy" approach to symmetry and equivalence; I answer objections to that approach raised by Dasgupta.</div><br><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;"><strong>David Wallace, <em>Isolated Systems and their Symmetries</em></strong></div><br><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;">Physical theories, for the most part, should be understood as modelling isolated subsystems of a larger universe; doing so, among other benefits, greatly clarifies the interpretation of the dynamical symmetries of those theories. I provide a detailed framework for analysing the subsystem structure of physical theories and applying it to the interpretation of their symmetries: the core concept is subsystem recursivity, whereby interpretative conclusions about a sector of a theory can be deduced from considering subsystems of other models of the same theory. I illustrate the framework by examples from particle mechanics and field theory.</div><br><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;"><strong>Valeriya Chasova, <em>Observable Diffeomorphisms (or, How to Limit the Hole Argument and Extend Direct Empirical Status)</em></strong></div><br><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;">According to the hole argument, theoretical diffeomorphism symmetries are superfluous. According to some studies of direct empirical status (DES), they are not. I reconcile the two by showing that they apply to different kinds of symmetries. I tell which kinds these are more precisely, construct using them the first ever explicit demonstration of DES for theoretical diffeomorphism symmetries, and explain how to go beyond these kinds to further contexts yielding DES. My analysis amounts to a rather radical revision of traditional views on the ontology of theoretical symmetries and on DES.</div><br><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;"><strong>JB Manchak (joint work with Thomas Barrett), <em>A Hierarchy of Spacetime Symmetries: Holes to Heraclitus</em></strong></div><br><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt;">We present a hierarchy of symmetry conditions within the context of general relativity. The weakest condition captures a sense in which spacetime is free of symmetry "holes" of a certain type. All standard models of general relativity satisfy the condition but we show that violations can occur if the Hausdorff assumption is dropped. On the other extreme, the strongest condition of the hierarchy is satisfied whenever a model is completely devoid of symmetries. In these "Heraclitus spacetimes," no pair of distinct points can be mapped (even locally) into one another. We prove that such spacetimes exist and show a sense in which Heraclitus spacetimes are completely determined by their local properties. We close with a brief comment on the extendibility properties of the various symmetry conditions.<br></div></div></div></div><br></div></div></body></html>