XPost: comp.theory, sci.math, comp.lang.prolog   
   From: tristan.wibberley+netnews2@alumni.manchester.ac.uk   
      
   >> olcott kirjoitti 10.12.2025 klo 16.10:   
      
   >>> Y will stand for foo(Y), which is foo(foo(Y)) (because of   
   >>> what Y stands for), which is foo(foo(foo(Y))), and so on.   
      
   On 11/12/2025 14:17, olcott wrote:   
      
   > As I say non-terminating, thus never resolves to a truth value.   
   >   
      
   $ export S='G=foo(G).'; gprolog <<<"$S"; swipl <<<"$S"   
   GNU Prolog 1.4.5 (64 bits)   
   Compiled Feb 23 2020, 20:14:50 with gcc   
   By Daniel Diaz   
   Copyright (C) 1999-2020 Daniel Diaz   
   | ?-   
      
   cannot display cyclic term for G   
      
   yes   
   | ?-   
   Welcome to SWI-Prolog (threaded, 64 bits, version 8.4.2)   
   SWI-Prolog comes with ABSOLUTELY NO WARRANTY. This is free software.   
   Please run ?- license. for legal details.   
      
   For online help and background, visit https://www.swi-prolog.org   
   For built-in help, use ?- help(Topic). or ?- apropos(Word).   
      
   G = foo(G).   
      
      
   % halt   
      
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   Tristan Wibberley   
      
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    * Origin: you cannot sedate... all the things you hate (1:229/2)