Search results for 'time reversal' (try it on Scholar)

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  1. M. Castagnino, M. Gadella & O. Lombardi (2006). Time-Reversal, Irreversibility and Arrow of Time in Quantum Mechanics. Foundations of Physics 36 (3):407-426.score: 192.0
    The aim of this paper is to analyze time-asymmetric quantum mechanics with respect of its validity as a non time-reversal invariant, time-asymmetric theory as well as of its ability to determine an arrow of time.
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  2. Frank Arntzenius & Hilary Greaves (2009). Time Reversal in Classical Electromagnetism. British Journal for the Philosophy of Science 60 (3):557-584.score: 180.0
    Richard Feynman has claimed that anti-particles are nothing but particles `propagating backwards in time'; that time reversing a particle state always turns it into the corresponding anti-particle state. According to standard quantum field theory textbooks this is not so: time reversal does not turn particles into anti-particles. Feynman's view is interesting because, in particular, it suggests a nonstandard, and possibly illuminating, interpretation of the CPT theorem. In this paper, we explore a classical analog of Feynman's view, (...)
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  3. John Earman (2002). What Time Reversal Invariance is and Why It Matters. International Studies in the Philosophy of Science 16 (3):245 – 264.score: 180.0
    David Albert's Time and Chance (2000) provides a fresh and interesting perspective on the problem of the direction of time. Unfortunately, the book opens with a highly non-standard exposition of time reversal invariance that distorts the subsequent discussion. The present article not only has the remedial goal of setting the record straight about the meaning of time reversal invariance, but it also aims to show how the niceties of this symmetry concept matter to the (...)
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  4. David Malament (2004). On the Time Reversal Invariance of Classical Electromagnetic Theory. Studies in History and Philosophy of Science Part B 35 (2):295-315.score: 180.0
    David Albert claims that classical electromagnetic theory is not time reversal invariant. He acknowledges that all physics books say that it is, but claims they are ``simply wrong" because they rely on an incorrect account of how the time reversal operator acts on magnetic fields. On that account, electric fields are left intact by the operator, but magnetic fields are inverted. Albert sees no reason for the asymmetric treatment, and insists that neither field should be inverted. (...)
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  5. Jill North (2008). Two Views on Time Reversal. Philosophy of Science 75 (2):201-223.score: 180.0
    In a recent paper, Malament (2004) employs a time reversal transformation that differs from the standard one, without explicitly arguing for it. This is a new and important understanding of time reversal that deserves arguing for in its own right. I argue that it improves upon the standard one. Recent discussion has focused on whether velocities should undergo a time reversal operation. I address a prior question: What is the proper notion of time (...)
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  6. E. C. G. Sudarshan & L. C. Biedenharn (1995). Time Reversal for Systems with Internal Symmetry. Foundations of Physics 25 (1):139-143.score: 180.0
    Wigner time reversal implemented by antiunitary transformations on the wavefunctions is to be refined if we are to deal with systems with internal symmetry. The necessary refinements are formulated. Application to a number of physical problems is made with some unexpected revelations about some popular models.
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  7. Mario Castagnino, Manuel Gadella & Olimpia Lombardi, Time-Reversal Invariance and Irreversibility in Time-Asymmetric Quantum Mechanics.score: 180.0
    The aim of this paper is to analyze the concepts of time-reversal invariance and irreversibility in the so-called 'time-asymmetric quantum mechanics'. We begin with pointing out the difference between these two concepts. On this basis, we show that irreversibility is not as tightly linked to the semigroup evolution laws of the theory -which lead to its non time-reversal invariance- as usually suggested. In turn, we argue that the irreversible evolutions described by the theory are coarse-grained (...)
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  8. Sun-Tak Hwang (1972). A New Interpretation of Time Reversal. Foundations of Physics 2 (4):315-326.score: 180.0
    A new interpretation of the time-reversal invariance principle is given. As a result, it is shown that microscopic dynamic reversibility has no basis in physics. The existing contradiction between one-way time and two-way time is reconciled. It is also pointed out that the common notion that clocks run backwards when time is reversed is wrong.
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  9. E. J. Post (1979). The Logic of Time Reversal. Foundations of Physics 9 (1-2):129-161.score: 180.0
    Active time reversal in the sense of “object reversal” and passive time reversal in the sense of a frame reversal of time are discussed separately and then together so as to bring out their dual nature. An understanding of that duality makes it unavoidable to contrast symmetry properties of matter with symmetry properties to be assigned to antimatter. Only frame reversal of time can “see” all conceivable active time reversals relevant (...)
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  10. A. O. Barut (1983). On Conservation of Parity and Time Reversal and Composite Models of Particles. Foundations of Physics 13 (1):7-12.score: 180.0
    We show that it is possible to consider parity and time reversal, as basic geometric symmetry operations, as being absolutely conserved. The observations of symmetry-violating pseudoscalar quantities can be attributed to the fact that some particles, due to their internal structure, are not eigenstates of parity or CP, and there is no reason that they should be. In terms of a model it is shown how, in spite of this, pseudoscalar terms are small in strong interactions. The neutrino (...)
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  11. Robert C. Bishop, Quantum Time Arrows, Semigroups and Time-Reversal in Scattering.score: 164.0
    Two approaches toward the arrow of time for scattering processes have been proposed in rigged Hilbert space quantum mechanics. One, due to Arno Bohm, involves preparations and registrations in laboratory operations and results in two semigroups oriented in the forward direction of time. The other, employed by the Brussels-Austin group, is more general, involving excitations and de-excitations of systems, and apparently results in two semigroups oriented in opposite directions of time. It turns out that these two (...) arrows can be related to each other via Wigner's extensions of the spacetime symmetry group. Furthermore, their are subtle differences in causality as well as the possibilities for the existence and creation of time-reversed states depending on which time arrow is chosen. (shrink)
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  12. Mario Bunge (1972). Time Asymmetry, Time Reversal, and Irreversibility. In. In J. T. Fraser, F. Haber & G. Muller (eds.), The Study of Time. Springer-Verlag. 122--130.score: 156.0
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  13. Suchoon S. Mo (1990). Time Reversal in Human Cognition: Search for a Temporal Theory of Insanity. In Richard A. Block (ed.), Cognitive Models of Psychological Time. Lawrence Erlbaum. 241--254.score: 156.0
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  14. Steven F. Savitt (1994). Is Classical Mechanics Time Reversal Invariant? British Journal for the Philosophy of Science 45 (3):907-913.score: 150.0
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  15. Craig Callender (1995). The Metaphysics of Time Reversal: Hutchison on Classical Mechanics. British Journal for the Philosophy of Science 46 (3):331-340.score: 150.0
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  16. Murray Macbeath (1983). Communication and Time Reversal. Synthese 56 (1):27 - 46.score: 150.0
  17. Harald Atmanspacher, Mind and Matter as Asymptotically Disjoint, Inequivalent Representations with Broken Time-Reversal Symmetry.score: 150.0
    body. While the latter areas are discussed mainly in fields such as the philosophy of mind, cognitive Many philosophical and scientific discussions of top-.
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  18. Stephen Leeds (2006). Discussion: Malament on Time Reversal. Philosophy of Science 73 (4):448-458.score: 150.0
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  19. Frank Arntzenius (2004). Time Reversal Operations, Representations of the Lorentz Group, and the Direction of Time. Studies in History and Philosophy of Science Part B 35 (1):31-43.score: 150.0
  20. C. T. K. Chari (1963). Time Reversal, Information Theory, and "World-Geometry". Journal of Philosophy 60 (20):579-583.score: 150.0
  21. Arno Bohm & Sujeewa Wickramasekara (1997). The Time Reversal Operator for Semigroup Evolutions. Foundations of Physics 27 (7):969-993.score: 150.0
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  22. Leah Henderson (2014). Can the Second Law Be Compatible with Time Reversal Invariant Dynamics? Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 47:90-98.score: 150.0
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  23. Stephen Crocker (2001). Into the Interval: On Deleuze's Reversal of Time and Movement. Continental Philosophy Review 34 (1):45-67.score: 144.0
    The reversal in the relation of time and movement which Deleuze describes in his Cinema books does not only concern a change in the filmic arts. Deleuze associates it with a wider Copernican turn in science, philosophy, art and indeed modern experience as a whole. Experience no longer consists of an idea plus the time it takes to realize it. Instead, time is implicated in the determination, literally the creation of the terminus of any movement of (...)
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  24. Irene T. Armstrong, Melissa Judson, Douglas P. Munoz, Roland S. Johansson & J. Randall Flanagan (2013). Waiting for a Hand: Saccadic Reaction Time Increases in Proportion to Hand Reaction Time When Reaching Under a Visuomotor Reversal. Frontiers in Human Neuroscience 7.score: 132.0
  25. John G. Cramer (1988). Velocity Reversal and the Arrows of Time. Foundations of Physics 18 (12):1205-1212.score: 126.0
    Agendanken experiment is proposed for distinguishing between two models accounting for the macroscopic arrow of time. The experiment involves the veloeity revesal of components of an isolated system, and the two models give contrasting predictions as to its behavior.
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  26. Matt Farr & Alexander Reutlinger (2013). A Relic of a Bygone Age? Causation, Time Symmetry and the Directionality Argument. Erkenntnis 78 (2):215-235.score: 120.0
    Bertrand Russell famously argued that causation is not part of the fundamental physical description of the world, describing the notion of cause as “a relic of a bygone age” (Russell in Proc Aristot Soc 13:1–26, 1913). This paper assesses one of Russell’s arguments for this conclusion: the ‘Directionality Argument’, which holds that the time symmetry of fundamental physics is inconsistent with the time asymmetry of causation. We claim that the coherence and success of the Directionality Argument crucially depends (...)
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  27. Dick J. Bierman & D. I. Radin (1999). Conscious and Anomalous Non-Conscious Emotional Processes: A Reversal of the Arrow of Time. In S. Hameroff, A. Kaszniak & David Chalmers (eds.), Toward a Science of Consciousness Iii: The Third Tucson Discussions and Debates. Mit Press. 367--385.score: 120.0
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  28. E. Scott Geller, Charles P. Whitman, Richard F. Wrenn & William G. Shipley (1971). Expectancy and Discrete Reaction Time in a Probability Reversal Design. Journal of Experimental Psychology 90 (1):113.score: 120.0
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  29. K. B. Wharton (2007). Time-Symmetric Quantum Mechanics. Foundations of Physics 37 (1):159-168.score: 96.0
    A time-symmetric formulation of nonrelativistic quantum mechanics is developed by applying two consecutive boundary conditions onto solutions of a time- symmetrized wave equation. From known probabilities in ordinary quantum mechanics, a time-symmetric parameter P0 is then derived that properly weights the likelihood of any complete sequence of measurement outcomes on a quantum system. The results appear to match standard quantum mechanics, but do so without requiring a time-asymmetric collapse of the wavefunction upon measurement, thereby realigning quantum (...)
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  30. David Z. Albert (2000). Time and Chance. Harvard University Press.score: 90.0
    This book is an attempt to get to the bottom of an acute and perennial tension between our best scientific pictures of the fundamental physical structure of the ...
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  31. Bryan W. Roberts (2012). Kramers Degeneracy Without Eigenvectors. Physical Review A 86 (3):034103.score: 90.0
    Wigner gave a well-known proof of Kramers degeneracy, for time reversal invariant systems containing an odd number of half-integer spin particles. But Wigner's proof relies on the assumption that the Hamiltonian has an eigenvector, and thus does not apply to many quantum systems of physical interest. This note illustrates an algebraic way to talk about Kramers degeneracy that does not appeal to eigenvectors, and provides a derivation of Kramers degeneracy in this more general context.
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  32. Mario Castagnino & Olimpia Lombardi (2009). The Global Non-Entropic Arrow of Time: From Global Geometrical Asymmetry to Local Energy Flow. Synthese 169 (1):1 - 25.score: 72.0
    Since the nineteenth century, the problem of the arrow of time has been traditionally analyzed in terms of entropy by relating the direction past-to-future to the gradient of the entropy function of the universe. In this paper, we reject this traditional perspective and argue for a global and non-entropic approach to the problem, according to which the arrow of time can be defined in terms of the geometrical properties of spacetime. In particular, we show how the global non-entropic (...)
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  33. Carlo Rovelli (2004). Comment On: “Causality and the Arrow of Classical Time”, by Fritz Rohrlich. Studies in History and Philosophy of Science Part B 35 (3):397-405.score: 72.0
    Rohrlich claims that “the problem of the arrow of time in classical dynamics has been solved”. The solution he proposes is based on the equations governing the motion of extended particles. Rohrlich claims that these equations, which must take self-interaction into account, are not invariant under time reversal. I dispute this claim, on several grounds.
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  34. Joan A. Vaccaro (2011). T Violation and the Unidirectionality of Time. Foundations of Physics 41 (10):1569-1596.score: 72.0
    An increasing number of experiments at the Belle, BNL, CERN, DAΦNE and SLAC accelerators are confirming the violation of time reversal invariance (T). The violation signifies a fundamental asymmetry between the past and future and calls for a major shift in the way we think about time. Here we show that processes which violate T symmetry induce destructive interference between different paths that the universe can take through time. The interference eliminates all paths except for two (...)
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  35. Gustavo E. Romero & Daniela Pérez (2011). Time and Irreversibility in an Accelerating Universe. International Journal of Modern Physics D 20:2831-2838.score: 72.0
    It is a remarkable fact that all processes occurring in the observable universe are irre- versible, whereas the equations through which the fundamental laws of physics are formu- lated are invariant under time reversal. The emergence of irreversibility from the funda- mental laws has been a topic of consideration by physicists, astronomers and philosophers since Boltzmann's formulation of his famous \H" theorem. In this paper we shall discuss some aspects of this problem and its connection with the dynamics (...)
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  36. Neil M. McLachlan, Loretta J. Greco, Emily C. Toner & Sarah J. Wilson (2010). Using Spatial Manipulation to Examine Interactions Between Visual and Auditory Encoding of Pitch and Time. Frontiers in Psychology 1:233-233.score: 72.0
    Music notations use both symbolic and spatial representation systems. Novice musicians do not have the training to associate symbolic information with musical identities, such as chords or rhythmic and melodic patterns. They provide an opportunity to explore the mechanisms underpinning multimodal learning when spatial encoding strategies of feature dimensions might be expected to dominate. In this study, we applied a range of transformations (such as time reversal) to short melodies and rhythms and asked novice musicians to identify them (...)
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  37. Martin Land (2005). Discrete Symmetries of Off-Shell Electromagnetism. Foundations of Physics 35 (7):1263-1288.score: 66.0
    This paper discusses the discrete symmetries of off-shell electromagnetism, the Stueckelberg–Schrodinger relativistic quantum theory and its associated 5D local gauge theory. Seeking a dynamical description of particle/antiparticle interactions, Stueckelberg developed a covariant mechanics with a monotonically increasing Poincaré-invariant parameter. In Stueckelberg’s framework, worldlines are traced out through the parameterized evolution of spacetime events, which may advance or retreat with respect to the laboratory clock, depending on the sign of the energy, so that negative energy trajectories appear as antiparticles when the (...)
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  38. Amit Hagar (2004). Chance and Time. Dissertation, UBCscore: 60.0
    One of the recurrent problems in the foundations of physics is to explain why we rarely observe certain phenomena that are allowed by our theories and laws. In thermodynamics, for example, the spontaneous approach towards equilibrium is ubiquitous yet the time-reversal-invariant laws that presumably govern thermal behaviour in the microscopic level equally allow spontaneous departure from equilibrium to occur. Why are the former processes frequently observed while the latter are almost never reported? Another example comes from quantum mechanics (...)
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  39. Craig Callender (2000). Is Time 'Handed' in a Quantum World? Proceedings of the Aristotelian Society 100 (1):247-269.score: 60.0
    This paper considers the possibility that nonrelativistic quantum mechanics tells us that Nature cares about time reversal. In a classical world we have a fundamentally reversible world that appears irreversible at higher levels, e.g., the thermodynamic level. But in a quantum world we see, if I am correct, a fundamentally irreversible world that appears reversible at higher levels, e.g., the level of classical mechanics. I consider two related symmetries, time reversal invariance and what I call ‘Wigner (...)
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  40. Mario Castagnino, Manuel Gadella & Olimpia Lombardi (2005). Time's Arrow and Irreversibility in Time-Asymmetric Quantum Mechanics. International Studies in the Philosophy of Science 19 (3):223 – 243.score: 60.0
    The aim of this paper is to analyze time-asymmetric quantum mechanics with respect to the problems of irreversibility and of time's arrow. We begin with arguing that both problems are conceptually different. Then, we show that, contrary to a common opinion, the theory's ability to describe irreversible quantum processes is not a consequence of the semigroup evolution laws expressing the non-time-reversal invariance of the theory. Finally, we argue that time-asymmetric quantum mechanics, either in Prigogine's version (...)
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  41. Fritz Rohrlich (1998). The Arrow of Time in the Equations of Motion. Foundations of Physics 28 (7):1045-1056.score: 60.0
    It is argued that time's arrow is present in all equations of motion. But it is absent in the point particle approximations commonly made. In particular, the Lorentz-Abraham-Dirac equation is time-reversal invariant only because it approximates the charged particle by a point. But since classical electrodynamics is valid only for finite size particles, the equations of motion for particles of finite size must be considered. Those equations are indeed found to lack time-reversal invariance, thus ensuring (...)
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  42. Bryan W. Roberts (2013). The Simple Failure of Curie's Principle. Philosophy of Science 80 (4):579-592.score: 60.0
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  43. F. Rohrlich (2000). Causality and the Arrow of Classical Time. Studies in History and Philosophy of Science Part B 31 (1):1-13.score: 60.0
    It is claimed that the `problem of the arrow of time in classical dynamics' has been solved. Since all classical particles have a self-field (gravitational and in some cases also electromagnetic), their dynamics must include self-interaction. This fact and the observation that the domain of validity of classical physics is restricted to distances not less than of the order of a Compton wavelength (thus excluding point particles), leads to the conclusion that the fundamental classical equations of motion are not (...)
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  44. Mario Bunge (1968). Physical Time: The Objective and Relational Theory. Philosophy of Science 35 (4):355-388.score: 60.0
    An objective and relational theory of local time is expounded and its philosophical implications are discussed in Sect. 2. In Sect. 3 certain physical and metaphysical questions concerning time are taken up in the light of that theory. The basic concepts of the theory are those of event, reference frame, chronometric scale, and time function. These are subject to four axioms: existence of events, frames and scales; time is a real valued function; the set of events (...)
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  45. E. J. Post (1979). Comments on “Parity and Time Inversion Symmetries of Electromagnetic Systems” by R. M. Kiehn. Foundations of Physics 9 (5-6):421-424.score: 60.0
    Previous statements concerning the reduction of possible parity and time reversal choices for electromagnetic quantities are amplified for the sake of clearer understanding.
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  46. R. M. Kiehn (1979). Reply to Post's Comments on “Parity and Time Inversion Symmetries of Electromagnetic Systems”. Foundations of Physics 9 (5-6):425-426.score: 60.0
    Points of agreement and disagreement with Post's remarks on the author's discussion of the criteria to be used for reducing the eight parity and time reversal symmetry choices that the formally possible for electromagnetic quantities are noted.
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  47. O. Costa de Beauregard (1982). MPT Versus: A Manifestly Covariant Presentation of Motion Reversal and Particle-Antiparticle Exchange. [REVIEW] Foundations of Physics 12 (9):861-871.score: 60.0
    We show that particle-antiparticle exchange and covariant motion reversal are two physically different aspects of the same mathematical transformation, either in the prequantal relativistic equation of motion of a charged point particle, in the general scheme of second quantization, or in the spinning wave equations of Dirac and of Petiau-Duffin-Kemmer. While, classically, charge reversal and rest mass reversal are equivalent operations, in the wave mechanical case mass reversal must be supplemented by exchange of the two adjoint (...)
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  48. R. M. Kiehn (1977). Parity and Time Inversion Symmetries of Electromagnetic Systems. Foundations of Physics 7 (5-6):301-311.score: 60.0
    By forming the intersections of the parity and time reversal equivalence classes of physical entities that are represented by differential forms and differential form densities, a number of subsets of discrete symmetry classes for electromagnetic systems can be generated. Only one of these subsets is consistent with elementary thermodynamic arguments for dissipative systems and at the same time yields the notion that both charge and mass are spacetime scalars. This subset is not in correspondence with the two (...)
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  49. Bryan W. Roberts, When We Do (and Do Not) Have a Classical Arrow of Time.score: 60.0
    I point out that some common folk wisdom about time reversal invariance in classical mechanics is strictly incorrect, by showing some explicit examples in which classical time reversal invariance fails, even among conservative systems. I then show that there is nevertheless a broad class of familiar classical systems that are time reversal invariant.
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  50. Dagmar Bruß & Chiara Macchiavello (2005). How the First Partial Transpose Was Written. Foundations of Physics 35 (11):1921-1926.score: 60.0
    We tell the tale of the first writing of a partial transpose, without guaranteeing historical authenticity.
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