he treatment of such entities depends on the implementation, they are not formally defined
in Chapter&#x00A0;<a 
href="haskellch9.html#x16-1710009">9<!--tex4ht:ref: stdprelude --></a>. The implementation of <span 
class="pcrr7t-">Prelude</span> is also incomplete in its treatment of tuples: there
should be an infinite family of tuples and their instance declarations, but the implementation only gives a
scheme.
 <p class="noindent"> Chapter&#x00A0;<a 
href="haskellch9.html#x16-1710009">9<!--tex4ht:ref: stdpr