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<b>let </b><font color="Maroon">s</font> be   <a href="nat_1.html#NM1">Nat</a>;<br/>

<b>reconsider </b><font color="Maroon">m</font> = <font color="Maroon">s</font> <a href="xcmplx_0.html#K6">-</a> 0 as    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>  <b>by </b><i><a class="ref" href="ordinal1.html#D13">ORDINAL1:def 13</a></i>;<br/>
<a NAME="E2:32"/><i><font color="Green">E41</font></i>: 
<font color="Maroon">s</font> <a href="newton.html#K6" target="_self">!</a>  <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> 0
 
<b>by </b><i/>;<br/>
<a NAME="E3:32"/>
<font color="Maroon">m</font> <a href="hidden.html#R1">=</a> <font color="Maroon">s</font>
 
;<br/>
<b>then </b><font color="Maroon">s</font> <a href="newton.html#K8" target="_self">choose</a> 0 = 
<span class="p1">(<span class="default"><font color="Maroon">s</font> <a href="newton.html#K6" target="_self">!</a> </span>)</span> <a href="xcmplx_0.html#K7">/</a> <span class="p1">(<span class="default">1 <a href="xcmplx_0.html#K3">*</a> <span class="p2">(<span class="default"><font color="Maroon">s</font> <a href="newton.html#K6" target="_self">!</a> </span>)</span></span>)</span>
<b>by </b><i>, </i>
<br/>.= 
1
<b>by </b><i>, <a class="ref" href="xcmplx_1.html#T60">XCMPLX_1:60</a></i>
;<br/>
<b>hence </b><a NAME="E5:32"/>
<font color="Maroon">s</font> <a href="newton.html#K8" target="_self">choose</a> 0 <a href="hidden.html#R1">=</a> 1
 ;<br/>


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