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<b>let </b><font color="Maroon" title="c1">n</font> be    <a href="ordinal1.html#NM1" title="ORDINAL1:NM.1">number</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="ordinal1.html#V7" title="ORDINAL1:attr.7">natural</a> implies <font color="Maroon" title="c1">n</font> is <a href="int_1.html#V1" title="INT_1:attr.1">integer</a> )</span><br/>

<b>assume </b><a NAME="E1:9_2_1"/>
<font color="Maroon" title="c1">n</font> is <a href="ordinal1.html#V7" title="ORDINAL1:attr.7">natural</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="int_1.html#V1" title="INT_1:attr.1">integer</a></span><br/>

<a NAME="E2:9_2_1"/><b>then </b>
<font color="Maroon" title="c1">n</font> is    <a href="subset_1.html#M2" title="SUBSET_1:mode.2">Element</a> of  <a href="numbers.html#K5" title="NUMBERS:func.5">NAT</a> 
 
<b>by </b><i><a class="ref" href="ordinal1.html#D13" title="ORDINAL1:def.13">ORDINAL1:def 13</a></i>;<br/>
<b>hence </b><a NAME="E3:9_2_1"/>
<font color="Maroon" title="c1">n</font> is <a href="int_1.html#V1" title="INT_1:attr.1">integer</a>
 <b>by </b><i><a class="ref" href="int_1.html#T7" target="_self" title="INT_1:th.7">Th7</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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