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<span class="kw">let </span><font color="Maroon" title="c1">n</font> be   <a href="nat_1.html#NM1" title="NAT_1:NM.1">Nat</a>; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="Red">::  thesis: </font></span></a><span class="hide"> <font color="Maroon" title="c1">n</font> is  <a href="membered.html#V6" title="MEMBERED:attr.6">natural-membered</a> </span><br/>

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for <font color="Olive" title="b1">x</font> being   <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a>   st <font color="Olive" title="b1">x</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c1">n</font> holds <br/><font color="Olive" title="b1">x</font> is  <a href="ordinal1.html#V7" title="ORDINAL1:attr.7">natural</a> 
 
<span class="kw">by</span> <span class="lab"><a class="ref" href="afinsq_2.html#T1" target="_self" title="AFINSQ_2:th.1">Th1</a></span>;<br/>
<span class="kw">hence </span><a NAME="E2:4_1_1"/>
<font color="Maroon" title="c1">n</font> is  <a href="membered.html#V6" title="MEMBERED:attr.6">natural-membered</a> 
 <span class="kw">by</span> <span class="lab"><a class="ref" href="membered.html#D6" title="MEMBERED:def.6">MEMBERED:def 6</a></span>; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="Red">::  thesis: </font></span></a><span class="hide"> verum</span><br/>


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