eyword">val</span> commutativity : <span><span class="type-var">'a</span> <a href="argument-1-A/index.html#type-t">A.t</a></span> <span>&#45;&gt;</span> <span><span class="type-var">'a</span> <a href="argument-1-A/index.html#type-t">A.t</a></span> <span>&#45;&gt;</span> bool</code></dt></dl></div></body></html>