<?xml version="1.0"?>
<div class="add">

<b>let </b><font color="Maroon">c<sub>1</sub></font> be   <a href="vectsp_1.html#NM2">Field</a>;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font> be   <a href="polynom3.html#NM1">Polynomial</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>



<b>assume </b><a NAME="E1:78"/><i><font color="Green">E56</font></i>: 
 <a href="algseq_1.html#K3">len</a> <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> 0
 ;<br/>

<b>thus </b><a NAME="E2:78"/>
( <font color="Maroon">c<sub>2</sub></font> is <a href="polynom5.html#V1" target="_self">with_roots</a> implies  <a href="polynom5.html#K7" target="_self">NormPolynomial</a> <font color="Maroon">c<sub>2</sub></font> is <a href="polynom5.html#V1" target="_self">with_roots</a> )
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="78_1"><b>proof </b></a><div class="add">

<b>assume </b><a NAME="E1:78_1"/>
<font color="Maroon">c<sub>2</sub></font> is <a href="polynom5.html#V1" target="_self">with_roots</a>
 ;<br/>

<b>then consider </b><font color="Maroon">c<sub>3</sub></font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>1</sub></font><b> such that </b><br/><a NAME="E3:78_1"/><i><font color="Green">E57</font></i>: 
<font color="Maroon">c<sub>3</sub></font> <a href="polynom5.html#R1" target="_self">is_a_root_of</a> <font color="Maroon">c<sub>2</sub></font>
 <b>by </b><i><a class="ref" href="polynom5.html#D7" target="_self">Def7</a></i>;<br/>
<a NAME="E4:78_1"/>
<font color="Maroon">c<sub>3</sub></font> <a href="polynom5.html#R1" target="_self">is_a_root_of</a>  <a href="polynom5.html#K7" target="_self">NormPolynomial</a> <font color="Maroon">c<sub>2</sub></font>
 
<b>by </b><i><a class="txt" href="polynom5.html#E1:78"><i><font color="Green">E56</font></i></a>, <a class="txt" href="polynom5.html#E3:78_1"><i><font color="Green">E57</font></i></a>, <a class="ref" href="polynom5.html#T60" target="_self">Th60</a></i>;<br/>
<b>hence </b><a NAME="E5:78_1"/>
 <a href="polynom5.html#K7" target="_self">NormPolynomial</a> <font color="Maroon">c<sub>2</sub></font> is <a href="polynom5.html#V1" target="_self">with_roots</a>
 <b>by </b><i><a class="ref" href="polynom5.html#D7" target="_self">Def7</a></i>;<br/>


</div><b>end;</b></div>

<b>assume </b><a NAME="E3:78"/>
 <a href="polynom5.html#K7" target="_self">NormPolynomial</a> <font color="Maroon">c<sub>2</sub></font> is <a href="polynom5.html#V1" target="_self">with_roots</a>
 ;<br/>

<b>then consider </b><font color="Maroon">c<sub>3</sub></font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>1</sub></font><b> such that </b><br/><a NAME="E5:78"/><i><font color="Green">E57</font></i>: 
<font color="Maroon">c<sub>3</sub></font> <a href="polynom5.html#R1" target="_self">is_a_root_of</a>  <a href="polynom5.html#K7" target="_self">NormPolynomial</a> <font color="Maroon">c<sub>2</sub></font>
 <b>by </b><i><a class="ref" href="polynom5.html#D7" target="_self">Def7</a></i>;<br/>
<a NAME="E6:78"/>
<font color="Maroon">c<sub>3</sub></font> <a href="polynom5.html#R1" target="_self">is_a_root_of</a> <font color="Maroon">c<sub>2</sub></font>
 
<b>by </b><i><a class="txt" href="polynom5.html#E1:78"><i><font color="Green">E56</font></i></a>, <a class="txt" href="polynom5.html#E5:78"><i><font color="Green">E57</font></i></a>, <a class="ref" href="polynom5.html#T60" target="_self">Th60</a></i>;<br/>
<b>hence </b><a NAME="E7:78"/>
<font color="Maroon">c<sub>2</sub></font> is <a href="polynom5.html#V1" target="_self">with_roots</a>
 <b>by </b><i><a class="ref" href="polynom5.html#D7" target="_self">Def7</a></i>;<br/>


</div>
