From: julio@diegidio.name   
      
   On Saturday, 3 September 2022 at 15:50:03 UTC+2, Thomas Koenig wrote:   
   > Julio Di Egidio  schrieb:   
   > >   
   > > And *reversibility* itself is already present in classical physics,   
   > > namely since the Hamiltonian/Lagrangian approaches, where the dynamics   
   > > of a system are described in terms of the evolution of a *system state*   
   > > in a state space: *that* evolution has to be reversible, indeed lack of   
   > > reversibility would simply not be a state space: IOW, given a "law of   
   > > motion", there must be one and only one next state, and one and only one   
   > > previous state, or the whole state-space based approach becomes simply   
   > > meaningless.   
   >   
   > And yet, the Second Law of Thermodynamics holds.   
      
   I did say except for the "measurement problem" and thermodynamics.   
   Thermodynamics is indeed another story: the laws of thermodynamics   
   are not exact laws, in fact thermodynamics is not deterministic, while,   
   to the point, the laws of quantum mechanics *are* exact and   
   deterministic: the fact that we measure probabilities has again to do   
   with "the problem of measurement", i.e. how we go from the quantum   
   state to a classical outcome, but, to reiterate, the evolution of the wave   
   function, as expressed by the Schroedinger equation, is per se indeed   
   deterministic.   
      
   Julio   
      
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