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<div><span class="kw">theorem </span><a NAME="T57"><span class="comment"><font color="firebrick">:: XBOOLEAN:57</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">p</font>, <font color="Olive" title="b2">q</font> being   <a href="xboolean.html#V1" title="XBOOLEAN:attr.1">boolean</a>   <a href="hidden.html#M1" title="HIDDEN:mode.1">object</a>  holds  <font color="Olive" title="b1">p</font> <a href="xboolean.html#K8" title="XBOOLEAN:func.8">'nand'</a> <span class="p1">(<span class="default"><font color="Olive" title="b1">p</font> <a href="xboolean.html#K8" title="XBOOLEAN:func.8">'nand'</a> <font color="Olive" title="b2">q</font></span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Olive" title="b1">p</font> <a href="xboolean.html#K6" title="XBOOLEAN:func.6">=&gt;</a> <font color="Olive" title="b2">q</font></div></div>
