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<b>let </b><font color="Maroon">n</font> be  <a href="ordinal1.html#V7">natural</a>  <a href="ordinal1.html#NM1" target="_self">number</a> ;<br/>

<div><b>hereby </b>
<div class="add"><b>assume </b><a NAME="E1:52_1"/>
<font color="Maroon">n</font> <a href="hidden.html#R2">in</a>  <a href="moebius1.html#K1" target="_self">SCNAT</a> 
 ;<br/><a NAME="E2:52_1"/><b>then </b>
not <font color="Maroon">n</font> is <a href="moebius1.html#V1" target="_self">square-containing</a>
 <b>by </b><i/>;<br/><b>hence </b><a NAME="E3:52_1"/>
 <a href="moebius1.html#K2" target="_self">Moebius</a> <font color="Maroon">n</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> 0
 <b>by </b><i/>;<br/></div>
<b>end;</b></div>

<b>assume </b><a NAME="E2:52"/>
 <a href="moebius1.html#K2" target="_self">Moebius</a> <font color="Maroon">n</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> 0
 ;<br/>

<a NAME="E3:52"/><b>then </b>
not <font color="Maroon">n</font> is <a href="moebius1.html#V1" target="_self">square-containing</a>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E4:52"/>
<font color="Maroon">n</font> <a href="hidden.html#R2">in</a>  <a href="moebius1.html#K1" target="_self">SCNAT</a> 
 <b>by </b><i/>;<br/>


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