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<a NAME="E1:1_1_1"/>
 <a href="tex_1.html#K2">ADTS</a> <font color="Maroon">D</font> <a href="hidden.html#R1">=</a>  <a href="pre_topc.html#G1">TopStruct</a>(# <font color="Maroon">D</font>,<span class="p1">(<span class="default"><a href="tex_1.html#K1">cobool</a> <font color="Maroon">D</font></span>)</span> #)
 
<b>by </b><i><a class="ref" href="tex_1.html#D3">TEX_1:def 3</a></i>;<br/>
<b>hence </b><a NAME="E2:1_1_1"/>
not  <a href="tex_1.html#K2">ADTS</a> <font color="Maroon">D</font> is <a href="realset2.html#V3">trivial</a>
 <b>by </b><i><a class="ref" href="realset2.html#D5">REALSET2:def 5</a></i>;<br/>


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