ns</h3>
<p>The <code>algebra_solver</code> function may be used without control
parameters; in this case</p>
<ul>
<li><p>its first argument refers to a function with signature
<code>( vector,  vector, real[], int[]) : vector</code>,</p></li>
<li><p>the remaining four arguments must be assignable to types
<code>vector</code>, <code>vector</code>, <code>real[]</code>, <code>int[]</code>, respectively and</p></li>
<li><p>the fourth and fifth arguments must be expressions
containing only variables originating f