From: moroney@world.std.spaamtrap.com   
      
   On 11/30/2022 2:19 AM, Phillip Helbig (undress to reply) wrote:   
   > In article ,   
   > Carl K  writes:   
   >   
   >> I used a new perfect (but simple) Newtonian physics engine to reverse a   
   >> billiards break. The simulation surprised me. I expected it to re-form a   
   >> stationary triangle of balls and spit out the cue ball. It did not.   
   >>   
   >> This means that classical physics is non-deterministic and not practically   
   >> reversible.   
   >   
   > It does not mean that it is non-deterministic.  Make a movie of the   
   > billiard break and run it backwards: perfectly valid physics.  Classical   
   > physics is reversible.   
   >   
   > That it is not reversible in practice is a different matter, but that   
   > was known before the simulation.   
      
   Is it chaotic in a way, that is, a tiny change in the backwards action   
   causes a completely different outcome?   
      
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