
 id="dx11-111001"></a>
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<p class="noindent"> Many of the features of Haskell are defined in Haskell itself as a library of standard datatypes, classes, and functions,
called the &#8220;Standard Prelude.&#8221; In Haskell, the Prelude is contained in the module <span 
class="pcrr7t-">Prelude</span>.<a 
 id="dx11-111003"></a> There are also many
predefined library modules, which provide less frequently used functions and types. For example, complex numbers,
arrays, and most of the i