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<b>let </b><font color="Maroon">c<sub>1</sub></font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font>, <font color="Maroon">c<sub>3</sub></font> be    <a href="pnproc_1.html#M1" target="_self">marking</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>





<b>assume </b><a NAME="E1:43"/><i><font color="Green">E31</font></i>: 
<font color="Maroon">c<sub>2</sub></font> <a href="pnproc_1.html#R2" target="_self">c=</a> <font color="Maroon">c<sub>3</sub></font>
 ;<br/>

<b>let </b><font color="Maroon">c<sub>4</sub></font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="pnproc_1.html#D2" target="_self">PNPROC_1:def 2</a><br/>

<b>assume </b><a NAME="E2:43"/><i><font color="Green">E32</font></i>: 
<font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>1</sub></font>
 ;<br/>

<b>then </b><span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>3</sub></font> <a href="pnproc_1.html#K5" target="_self">-</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="pnproc_1.html#K4" target="_self">+</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="pnproc_1.html#K2" target="_self">.</a> <font color="Maroon">c<sub>4</sub></font> = 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>3</sub></font> <a href="pnproc_1.html#K5" target="_self">-</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="pnproc_1.html#K2" target="_self">.</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="nat_1.html#K1">+</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="pnproc_1.html#K2" target="_self">.</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="pnproc_1.html#D5" target="_self">Def5</a></i>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>3</sub></font> <a href="pnproc_1.html#K2" target="_self">.</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="xcmplx_0.html#K6">-</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="pnproc_1.html#K2" target="_self">.</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span> <a href="xcmplx_0.html#K2">+</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="pnproc_1.html#K2" target="_self">.</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>
<b>by </b><i><a class="txt" href="pnproc_1.html#E1:43"><i><font color="Green">E31</font></i></a>, <a class="txt" href="pnproc_1.html#E2:43"><i><font color="Green">E32</font></i></a>, <a class="ref" href="pnproc_1.html#D6" target="_self">Def6</a></i>
<br/>.= 
<font color="Maroon">c<sub>3</sub></font> <a href="pnproc_1.html#K2" target="_self">.</a> <font color="Maroon">c<sub>4</sub></font>

;<br/>
<b>hence </b><a NAME="E4:43"/>
<font color="Maroon">c<sub>3</sub></font> <a href="pnproc_1.html#K2" target="_self">.</a> <font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>3</sub></font> <a href="pnproc_1.html#K5" target="_self">-</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="pnproc_1.html#K4" target="_self">+</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="pnproc_1.html#K2" target="_self">.</a> <font color="Maroon">c<sub>4</sub></font>
 ;<br/>


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