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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E4">Th8</font></span>: <a NAME="T8"><span class="comment"><font color="firebrick">:: BINTREE1:8</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">T1</font>, <font color="Olive" title="b2">T2</font> being   <a href="trees_1.html#NM1" title="TREES_1:NM.1">Tree</a> holds <br/> ( ( <font color="Olive" title="b1">T1</font> is  <a href="bintree1.html#V1" title="BINTREE1:attr.1">binary</a>  &amp; <font color="Olive" title="b2">T2</font> is  <a href="bintree1.html#V1" title="BINTREE1:attr.1">binary</a>  ) iff  <a href="trees_3.html#K13" title="TREES_3:func.13">tree</a> (<font color="Olive" title="b1">T1</font>,<font color="Olive" title="b2">T2</font>) is  <a href="bintree1.html#V1" title="BINTREE1:attr.1">binary</a>  )</div></div>
