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<b>let </b><font color="Maroon">c<sub>1</sub></font> be  <a href="ordinal1.html#V7">natural</a>  <a href="ordinal1.html#NM1" target="_self">number</a> ;<br/>

<font color="Maroon">c<sub>1</sub></font> <a href="binarith.html#K5">-'</a> 0 = 
<font color="Maroon">c<sub>1</sub></font> <a href="xcmplx_0.html#K6">-</a> 0
<b>by </b><i><a class="ref" href="binarith.html#D3">BINARITH:def 3</a></i>
<br/>.= 
<font color="Maroon">c<sub>1</sub></font>

;<br/>
<b>hence </b><a NAME="E2:2"/>
<font color="Maroon">c<sub>1</sub></font> <a href="binarith.html#K5">-'</a> 0 <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>1</sub></font>
 ;<br/>


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