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<a NAME="E1:8_1_1"/>
(  not <font color="Maroon">c<sub>2</sub></font> <a href="ordinal1.html#R1">c=</a> <font color="Maroon">c<sub>1</sub></font> or <font color="Maroon">c<sub>2</sub></font> <a href="ordinal1.html#R1">c=</a> <font color="Maroon">c<sub>1</sub></font> )
 
;<br/>
<a NAME="E2:8_1_1"/><b>then </b>
( <font color="Maroon">c<sub>1</sub></font> <a href="ordinal3.html#K5">-^</a> <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a>  <a href="xboole_0.html#K1">{}</a>  or <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>2</sub></font> <a href="ordinal2.html#K10">+^</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="ordinal3.html#K5">-^</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> )
 
<b>by </b><i><a class="ref" href="ordinal3.html#D6">ORDINAL3:def 6</a></i>;<br/>
<b>hence </b><a NAME="E3:8_1_1"/>
<font color="Maroon">c<sub>1</sub></font> <a href="ordinal3.html#K5">-^</a> <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R2">in</a>  <a href="ordinal1.html#K5">omega</a> 
 <b>by </b><i><a class="ref" href="arytm_3.html#T1" target="_self">Th1</a>, <a class="ref" href="ordinal1.html#D12">ORDINAL1:def 12</a></i>; <i><font color="Red">:: according to </font></i><a class="ref" href="ordinal1.html#D13">ORDINAL1:def 13</a><br/>


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