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<b>let </b><font color="Maroon">c<sub>3</sub></font> be   <a href="struct_0.html#NM7">Function</a> of <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font>;<br/>

<b>assume </b><a NAME="E1:94_1_1"/>
<font color="Maroon">c<sub>3</sub></font> is <a href="waybel_0.html#V18">sups-preserving</a>
 ;<br/>

<b>hence </b><a NAME="E2:94_1_1"/>
<font color="Maroon">c<sub>3</sub></font> <a href="waybel_0.html#R4">preserves_sup_of</a>  <a href="pre_topc.html#K1">{}</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="ref" href="waybel_0.html#D33">WAYBEL_0:def 33</a></i>; <i><font color="Red">:: according to </font></i><a class="ref" href="waybel34.html#D16" target="_self">WAYBEL34:def 16</a><br/>


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