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<span class="kw">consider </span><font color="Maroon" title="c1">T</font> being   <a href="trees_1.html#NM1" title="TREES_1:NM.1">Tree</a>;<br/>
<a NAME="E2:3_1_1"/>
<font color="Maroon" title="c1">T</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="trees_3.html#K1" title="TREES_3:func.1">Trees</a> 
 
<span class="kw">by</span> <span class="lab"><a class="ref" href="trees_3.html#D1" target="_self" title="TREES_3:def.1">Def1</a></span>;<br/>
<span class="kw">hence </span><a NAME="E3:3_1_1"/>
not  <a href="trees_3.html#K1" title="TREES_3:func.1">Trees</a>  is  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a> 
 ; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="Red">::  thesis: </font></span></a><span class="hide"> verum</span><br/>


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