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<b>let </b><font color="Maroon" title="c1">S</font> be    <a href="struct_0.html#L1" title="STRUCT_0:struct.1">1-sorted</a> ;<br/>

<b>assume </b><a NAME="E1:29_2_1"/>
not the <a href="struct_0.html#U1" title="STRUCT_0:sel.1">carrier</a> of <font color="Maroon" title="c1">S</font> is <a href="realset1.html#V1" title="REALSET1:attr.1">trivial</a>
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="struct_0.html#D9" target="_self" title="STRUCT_0:def.9">STRUCT_0:def 9</a><br/>

<b>hence </b><a NAME="E2:29_2_1"/>
not the <a href="struct_0.html#U1" title="STRUCT_0:sel.1">carrier</a> of <font color="Maroon" title="c1">S</font> is <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="struct_0.html#D1" target="_self" title="STRUCT_0:def.1">STRUCT_0:def 1</a><br/>


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