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<b>let </b><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:()"><i><font color="Red">::  thesis: </font></i></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/>

<a NAME="E1:2_1_1"/>
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>
 
<b>by </b><i><a class="ref" href="afinsq_2.html#T1" target="_self" title="AFINSQ_2:th.1">AB470</a></i>;<br/>
<b>hence </b><a NAME="E2:2_1_1"/>
<font color="Maroon" title="c1">n</font> is <a href="membered.html#V6" title="MEMBERED:attr.6">natural-membered</a>
 <b>by </b><i><a class="ref" href="membered.html#D6" title="MEMBERED:def.6">MEMBERED:def 6</a></i>; <a class="txt" onclick="hs(this)" href="javascript:()"><i><font color="Red">::  thesis: </font></i></a><span class="hide"> verum</span><br/>


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