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<b>let </b><font color="Maroon">c<sub>1</sub></font> be   <a href="group_1.html#NM1">Group</a>;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font>, <font color="Maroon">c<sub>3</sub></font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>1</sub></font>;<br/><b>let </b><font color="Maroon">c<sub>4</sub></font> be   <a href="nat_1.html#NM1">Nat</a>;<br/>







<b>assume </b><b>that </b><br/><a NAME="E1:1"/><i><font color="Green">E1</font></i>: 
 <a href="group_1.html#K7">ord</a> <font color="Maroon">c<sub>2</sub></font> <a href="xxreal_0.html#NR4" target="_self">&gt;</a> 1
 <b>and </b><br/><a NAME="E2:1"/><i><font color="Green">E2</font></i>: 
<font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>3</sub></font> <a href="group_1.html#K6">|^</a> <font color="Maroon">c<sub>4</sub></font>
 <b>and </b><br/><a NAME="E3:1"/><i><font color="Green">E3</font></i>: 
<font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R1">=</a> 0
 ;<br/>

<a NAME="E4:1"/>
<font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a>  <a href="group_1.html#K2">1.</a> <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="txt" href="gr_cy_2.html#E2:1"><i><font color="Green">E2</font></i></a>, <a class="txt" href="gr_cy_2.html#E3:1"><i><font color="Green">E3</font></i></a>, <a class="ref" href="group_1.html#T43">GROUP_1:43</a></i>;<br/>
<b>hence </b><a NAME="E5:1"/>
contradiction
 <b>by </b><i><a class="txt" href="gr_cy_2.html#E1:1"><i><font color="Green">E1</font></i></a>, <a class="ref" href="group_1.html#T84">GROUP_1:84</a></i>;<br/>


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