[HN Gopher] Arnold's Cat (2018)
       ___________________________________________________________________
        
       Arnold's Cat (2018)
        
       Author : bradly
       Score  : 22 points
       Date   : 2025-01-11 22:25 UTC (4 days ago)
        
 (HTM) web link (gerdbreitenbach.de)
 (TXT) w3m dump (gerdbreitenbach.de)
        
       | JadeNB wrote:
       | The page doesn't say why matrices need to have whole-number
       | (really just integer) entries, but I'd suspect it's because bad
       | approximations to non-integer rationals accumulate sufficiently
       | to make the recurrence unrecognizable.
        
         | pepinator wrote:
         | It says that the underlying action is on the torus (R/Z)^2. If
         | the entries of the matrix are not integers, do we have a well
         | defined action on the torus? It seems to me that the answer is
         | no because Z^2 would not be invariant by the action.
        
           | JadeNB wrote:
           | > It says that the underlying action is on the torus (R/Z)^2.
           | If the entries of the matrix are not integers, do we have a
           | well defined action on the torus? It seems to me that the
           | answer is no because Z^2 would not be invariant by the
           | action.
           | 
           | Ah, good point.
        
       | TaurenHunter wrote:
       | I clicked the link wondering if it would be about this "Arnold
       | the Cat" or perhaps related to Simon's Cat:
       | 
       | https://www.publishersweekly.com/9780316638111
        
       ___________________________________________________________________
       (page generated 2025-01-15 23:00 UTC)