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<b>let </b><font color="Maroon" title="c1">f</font> be  <a href="pencil_1.html#V11" title="PENCIL_1:attr.11">TopStruct-yielding</a> <a href="funct_1.html#NM1" title="FUNCT_1:NM.1">Function</a>;<br/>

<b>assume </b><a NAME="E1:31_2_1"/><i><font color="Green" title="E26">A2</font></i>: 
<font color="Maroon" title="c1">f</font> is <a href="pencil_1.html#V15" title="PENCIL_1:attr.15">PLS-yielding</a>
 ;<br/>

<b>let </b><font color="Maroon" title="c2">x</font> be    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="pencil_1.html#D15" target="_self" title="PENCIL_1:def.15">PENCIL_1:def 15</a><br/>

<b>assume </b><a NAME="E2:31_2_1"/>
<font color="Maroon" title="c2">x</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="relat_1.html#K2" title="RELAT_1:func.2">rng</a> <font color="Maroon" title="c1">f</font>
 ;<br/>

<b>hence </b><a NAME="E3:31_2_1"/>
<font color="Maroon" title="c2">x</font> is  non <a href="pencil_1.html#V3" title="PENCIL_1:attr.3">void</a>  <a href="pre_topc.html#L1" title="PRE_TOPC:struct.1">TopStruct</a> 
 <b>by </b><i><a class="txt" href="pencil_1.html#E1:31_2_1"><i><font color="Green" title="E26">A2</font></i></a>, <a class="ref" href="pencil_1.html#D19" target="_self" title="PENCIL_1:def.19">Def19</a></i>;<br/>


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