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<b>thus </b><a NAME="E1:24_1_1"/>
( <font color="Maroon">c<sub>1</sub></font> is <a href="pencil_1.html#V12" target="_self">non-void-yielding</a> implies for <font color="Olive">b<sub>1</sub></font> being   <a href="hidden.html#M1">set</a>  st <font color="Olive">b<sub>1</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> holds <br/><font color="Olive">b<sub>1</sub></font> is  non <a href="pencil_1.html#V3" target="_self">void</a>  <a href="pre_topc.html#L1">TopStruct</a>  )
 <b>by </b><i><a class="ref" href="pencil_1.html#D13" target="_self">Def13</a>, <a class="ref" href="pencil_1.html#D14" target="_self">Def14</a></i>;<br/>

<b>assume </b><a NAME="E2:24_1_1"/><i><font color="Green">E23</font></i>: 
for <font color="Olive">b<sub>1</sub></font> being   <a href="hidden.html#M1">set</a>  st <font color="Olive">b<sub>1</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> holds <br/><font color="Olive">b<sub>1</sub></font> is  non <a href="pencil_1.html#V3" target="_self">void</a>  <a href="pre_topc.html#L1">TopStruct</a> 
 ;<br/>

<b>let </b><font color="Maroon">c<sub>2</sub></font> be    <a href="pre_topc.html#L1">TopStruct</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="pencil_1.html#D14" target="_self">PENCIL_1:def 14</a><br/>

<b>thus </b><a NAME="E3:24_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> implies  not <font color="Maroon">c<sub>2</sub></font> is <a href="pencil_1.html#V3" target="_self">void</a> )
 <b>by </b><i><a class="txt" href="pencil_1.html#E2:24_1_1"><i><font color="Green">E23</font></i></a></i>;<br/>


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