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<div><span class="kw">theorem </span><a NAME="T53"><span class="comment"><font color="firebrick">:: BVFUNC_1:53</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">x</font>, <font color="Olive" title="b2">y</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   <a href="xboolean.html#K3" title="XBOOLEAN:func.3">'not'</a> <span class="p1">(<span class="default"><font color="Olive" title="b1">x</font> <a href="xboolean.html#K9" title="XBOOLEAN:func.9">'nor'</a> <font color="Olive" title="b2">y</font></span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Olive" title="b1">x</font> <a href="xboolean.html#K5" title="XBOOLEAN:func.5">'or'</a> <font color="Olive" title="b2">y</font> ;<br/></div></div>
