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<b>let </b><font color="Maroon">c<sub>2</sub></font> be  <a href="ordinal1.html#V7">natural</a>  <a href="ordinal1.html#NM1" target="_self">number</a> ;<br/>

<b>assume </b><a NAME="E1:65"/><i><font color="Green">E47</font></i>: 
<font color="Maroon">c<sub>2</sub></font> <a href="xxreal_0.html#NR4" target="_self">&gt;</a> 0
 ;<br/>

<a NAME="E2:65"/><i><font color="Green">E48</font></i>: 
0 <a href="hidden.html#R2">in</a>  <a href="gr_cy_1.html#K1">Segm</a> <font color="Maroon">c<sub>2</sub></font>
 
<b>by </b><i><a class="txt" href="int_3.html#E1:65"><i><font color="Green">E47</font></i></a>, <a class="ref" href="gr_cy_1.html#T12">GR_CY_1:12</a></i>;<br/>
<b>thus </b> <a href="rlvect_1.html#K1">0.</a> <span class="p1">(<span class="default"><a href="int_3.html#K9" target="_self">INT.Ring</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> = 
 <a href="funct_7.html#K1">In</a> 0,<span class="p1">(<span class="default"><a href="gr_cy_1.html#K1">Segm</a> <font color="Maroon">c<sub>2</sub></font></span>)</span>

<br/>.= 
0
<b>by </b><i><a class="txt" href="int_3.html#E2:65"><i><font color="Green">E48</font></i></a>, <a class="ref" href="funct_7.html#D1">FUNCT_7:def 1</a></i>
;<br/>


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