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<b>consider </b><font color="Maroon">c<sub>4</sub></font> being   <a href="nat_1.html#NM1">Nat</a><b> such that </b><br/><a NAME="E2:5_1_1"/><i><font color="Green">E5</font></i>: 
 <a href="facirc_1.html#K9">Following</a> <font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>4</sub></font> is <a href="circuit2.html#V1">stable</a>
 <b>by </b><i><a class="txt" href="circcmb3.html#E1:5"><i><font color="Green">E4</font></i></a>, <a class="ref" href="circcmb3.html#D1" target="_self">Def1</a></i>;<br/>
<b>take </b>
 <a href="facirc_1.html#K9">Following</a> <font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>4</sub></font>
;<br/>

<b>thus </b><a NAME="E3:5_1_1"/>
(  <a href="facirc_1.html#K9">Following</a> <font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>4</sub></font> is <a href="circuit2.html#V1">stable</a> &amp; ex <font color="Olive">b<sub>1</sub></font> being  <a href="nat_1.html#NM1">Nat</a> st  <a href="facirc_1.html#K9">Following</a> <font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R1">=</a>  <a href="facirc_1.html#K9">Following</a> <font color="Maroon">c<sub>3</sub></font>,<font color="Olive">b<sub>1</sub></font> )
 <b>by </b><i><a class="txt" href="circcmb3.html#E2:5_1_1"><i><font color="Green">E5</font></i></a></i>;<br/>


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