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<head><title>DEFREFINEMENT.html -- ACL2 Version 3.1</title></head>
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<h2>DEFREFINEMENT</h2>prove that <code>equiv1</code> refines <code>equiv2</code>
<pre>Major Section: <a href="EVENTS.html">EVENTS</a>
</pre><p>
<pre>
Example:
(defrefinement equiv1 equiv2)<p>
is an abbreviation for
(defthm equiv1-refines-equiv2
(implies (equiv1 x y) (equiv2 x y))
:rule-classes (:refinement))
</pre>
See <a href="REFINEMENT.html">refinement</a>.
<p>
<pre>
General Form:
(defrefinement equiv1 equiv2
:rule-classes rule-classes
:instructions instructions
:hints hints
:otf-flg otf-flg
:event-name event-name
:doc doc)
</pre>
where <code>equiv1</code> and <code>equiv2</code> are known <a href="EQUIVALENCE.html">equivalence</a> relations,
<code>event-name</code>, if supplied, is a symbol and all other arguments are as
specified in the documentation for <code><a href="DEFTHM.html">defthm</a></code>. The <code>defrefinement</code>
macro expands into a call of <code>defthm</code>. The name supplied is
<code>equiv1-refines-equiv2</code>, unless <code>event-name</code> is supplied, in which case
it is used as the name. The term supplied states that <code>equiv1</code>
refines <code>equiv2</code>. The rule-class <code>:refinement</code> is added to the
<code>rule-classes</code> specified, if it is not already there. All other
arguments to the generated <code>defthm</code> form are as specified by the other
keyword arguments above.
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