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<b>let </b><font color="Maroon">c<sub>1</sub></font> be   <a href="relat_1.html#NM1">Relation</a>;<br/>

<b>assume </b><a NAME="E1:27_1_1"/><i><font color="Green">E25</font></i>: 
<font color="Maroon">c<sub>1</sub></font> is <a href="pencil_1.html#V14" target="_self">non-Trivial-yielding</a>
 ;<br/>

<b>let </b><font color="Maroon">c<sub>2</sub></font> be    <a href="struct_0.html#L1">1-sorted</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="waybel_3.html#D7">WAYBEL_3:def 7</a><br/>

<b>assume </b><a NAME="E2:27_1_1"/>
<font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R2">in</a>  <a href="relat_1.html#K2">rng</a> <font color="Maroon">c<sub>1</sub></font>
 ;<br/>

<a NAME="E3:27_1_1"/><b>then </b>
<font color="Maroon">c<sub>2</sub></font> is  non <a href="realset2.html#V3">trivial</a>  <a href="struct_0.html#L1">1-sorted</a> 
 
<b>by </b><i><a class="txt" href="pencil_1.html#E1:27_1_1"><i><font color="Green">E25</font></i></a>, <a class="ref" href="pencil_1.html#D17" target="_self">Def17</a></i>;<br/>
<b>hence </b><a NAME="E4:27_1_1"/>
not <font color="Maroon">c<sub>2</sub></font> is <a href="struct_0.html#V3">empty</a>
 ;<br/>


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