 normally be used to testing one
      dimensional quadrature software.  It is possible to invoke a
      particular function by index, or to try out all available functions,
      as demonstrated in the sample calling program.
    </p>

    <p>
      For a given integrand function f(x), the problem is to estimate
      <pre>
        I(f) = integral ( -oo < x < +oo ) w(x) * f(x) dx
      </pre>
    </p>

    <p>
      We consider three variations of the problem, depending on the
      form of the weight fac