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Expand Up @@ -826,7 +826,7 @@ <h4> Using let to create local variables </h4>
<a name="%_sec_1.3.3" />
<h3> 1.3.3 Procedures as General Methods </h3>

<p> We introduced compound procedures in section @ref{1-1-4} as a mechanism for abstracting patterns of numerical operations so as to make them independent of the particular numbers involved. With higher-order procedures, such as the <tt>integral</tt> procedure of section @ref{1-3-1}, we began to see a more powerful kind of abstraction: procedures used to express general methods of computation, independent of the particular functions involved. In this section we discuss two more elaborate examples &mdash; general methods for finding zeros and fixed points of functions &mdash; and show how these methods can be expressed directly as procedures.
<p> We introduced compound procedures in section <a href="1-1-elements.html#%_sec_1.1.4">1.1.4</a> as a mechanism for abstracting patterns of numerical operations so as to make them independent of the particular numbers involved. With higher-order procedures, such as the <tt>integral</tt> procedure of section <a href="1-3-hop.html#%_sec_1.3.1">1.3.1</a>, we began to see a more powerful kind of abstraction: procedures used to express general methods of computation, independent of the particular functions involved. In this section we discuss two more elaborate examples &mdash; general methods for finding zeros and fixed points of functions &mdash; and show how these methods can be expressed directly as procedures.

<h4> Finding roots of equations by the half-interval method </h4>

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