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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/>

<a NAME="E1:73"/>
( <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a> 0 or <font color="Maroon">c<sub>1</sub></font> <a href="xxreal_0.html#NR4" target="_self">&gt;</a> 0 )
 
;<br/>
<b>hence </b><a NAME="E2:73"/>
0 <a href="hidden.html#R1">=</a> 0 <a href="nat_1.html#K4" target="_self">mod</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="ref" href="nat_1.html#T76" target="_self">Th76</a>, <a class="ref" href="nat_1.html#D2" target="_self">Def2</a></i>;<br/>


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