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<b>set </b><font color="Maroon">c<sub>3</sub></font> =  <a href="polynom1.html#K30" target="_self">Polynom-Ring</a> <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font>;<br/>
<b>thus </b><a NAME="E1:195_1_1"/>
 <a href="polynom1.html#K30" target="_self">Polynom-Ring</a> <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font> is <a href="group_1.html#V2">unital</a>
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="195_1_1_1"><b>proof </b></a><div class="add">

<b>take </b><font color="Maroon">c<sub>4</sub></font> =  <a href="vectsp_1.html#K2">1_</a> <span class="p1">(<span class="default"><a href="polynom1.html#K30" target="_self">Polynom-Ring</a> <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font></span>)</span>; <i><font color="Red">:: according to </font></i><a class="ref" href="group_1.html#D2">GROUP_1:def 2</a><br/>

<b>thus </b><a NAME="E1:195_1_1_1"/>
for <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of the <a href="struct_0.html#U1">carrier</a> of <span class="p1">(<span class="default"><a href="polynom1.html#K30" target="_self">Polynom-Ring</a> <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font></span>)</span> holds <br/>( <font color="Olive">b<sub>1</sub></font> <a href="group_1.html#K1">*</a> <font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R1">=</a> <font color="Olive">b<sub>1</sub></font> &amp; <font color="Maroon">c<sub>4</sub></font> <a href="group_1.html#K1">*</a> <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R1">=</a> <font color="Olive">b<sub>1</sub></font> )
 <b>by </b><i><a class="txt" href="polynom1.html#E122"><i><font color="Green">Lemma104</font></i></a></i>;<br/>


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

<b>let </b><font color="Maroon">c<sub>4</sub></font>, <font color="Maroon">c<sub>5</sub></font>, <font color="Maroon">c<sub>6</sub></font> be   <a href="struct_0.html#NM1">Element</a> of <span class="p1">(<span class="default"><a href="polynom1.html#K30" target="_self">Polynom-Ring</a> <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font></span>)</span>; <i><font color="Red">:: according to </font></i><a class="ref" href="vectsp_1.html#D11">VECTSP_1:def 11</a><br/>

<b>reconsider </b><font color="Maroon">c<sub>7</sub></font> = <font color="Maroon">c<sub>4</sub></font>, <font color="Maroon">c<sub>8</sub></font> = <font color="Maroon">c<sub>5</sub></font>, <font color="Maroon">c<sub>9</sub></font> = <font color="Maroon">c<sub>6</sub></font> as   <a href="polynom1.html#NM4">Polynomial</a> of <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font> <b>by </b><i><a class="ref" href="polynom1.html#D27" target="_self">Def27</a></i>;<br/>
<a NAME="E3:195_1_1"/><i><font color="Green">E105</font></i>: 
<font color="Maroon">c<sub>4</sub></font> <a href="group_1.html#K1">*</a> <font color="Maroon">c<sub>5</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>7</sub></font> <a href="polynom1.html#K28" target="_self">*'</a> <font color="Maroon">c<sub>8</sub></font>
 
<b>by </b><i><a class="ref" href="polynom1.html#D27" target="_self">Def27</a></i>;<br/>
<a NAME="E4:195_1_1"/><i><font color="Green">E106</font></i>: 
<font color="Maroon">c<sub>4</sub></font> <a href="group_1.html#K1">*</a> <font color="Maroon">c<sub>6</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>7</sub></font> <a href="polynom1.html#K28" target="_self">*'</a> <font color="Maroon">c<sub>9</sub></font>
 
<b>by </b><i><a class="ref" href="polynom1.html#D27" target="_self">Def27</a></i>;<br/>
<a NAME="E5:195_1_1"/>
<font color="Maroon">c<sub>5</sub></font> <a href="rlvect_1.html#K4">+</a> <font color="Maroon">c<sub>6</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>8</sub></font> <a href="polynom1.html#K23" target="_self">+</a> <font color="Maroon">c<sub>9</sub></font>
 
<b>by </b><i><a class="ref" href="polynom1.html#D27" target="_self">Def27</a></i>;<br/>
<b>hence </b><font color="Maroon">c<sub>4</sub></font> <a href="group_1.html#K1">*</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="rlvect_1.html#K4">+</a> <font color="Maroon">c<sub>6</sub></font></span>)</span> = 
<font color="Maroon">c<sub>7</sub></font> <a href="polynom1.html#K28" target="_self">*'</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>8</sub></font> <a href="polynom1.html#K23" target="_self">+</a> <font color="Maroon">c<sub>9</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="polynom1.html#D27" target="_self">Def27</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>7</sub></font> <a href="polynom1.html#K28" target="_self">*'</a> <font color="Maroon">c<sub>8</sub></font></span>)</span> <a href="polynom1.html#K23" target="_self">+</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>7</sub></font> <a href="polynom1.html#K28" target="_self">*'</a> <font color="Maroon">c<sub>9</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="polynom1.html#T85" target="_self">Th85</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="group_1.html#K1">*</a> <font color="Maroon">c<sub>5</sub></font></span>)</span> <a href="rlvect_1.html#K4">+</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="group_1.html#K1">*</a> <font color="Maroon">c<sub>6</sub></font></span>)</span>
<b>by </b><i><a class="txt" href="polynom1.html#E3:195_1_1"><i><font color="Green">E105</font></i></a>, <a class="txt" href="polynom1.html#E4:195_1_1"><i><font color="Green">E106</font></i></a>, <a class="ref" href="polynom1.html#D27" target="_self">Def27</a></i>
;<br/><br/>


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