> -&gt; <a href="Big_int.html#TYPEbig_int">big_int</a></code></pre><div class="info ">
Exponentiation functions.  Return the big integer
           representing the first argument <code class="code">a</code> raised to the power <code class="code">b</code>
           (the second argument).  Depending
           on the function, <code class="code">a</code> and <code class="code">b</code> can be either small integers
           or big integers.  Raise <code class="code"><span class="constructor">Invalid_argume