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<span class="kw">take </span>
 <a href="numbers.html#NK1" title="NUMBERS:NK.1">NAT</a> 
; <a class="txt" onmouseover="tooltip.show('hs',this)" onmouseout="tooltip.hide()" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> (  not  <a href="numbers.html#NK1" title="NUMBERS:NK.1">NAT</a>  is  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>  &amp;  <a href="numbers.html#NK1" title="NUMBERS:NK.1">NAT</a>  is  <a href="membered.html#V7" title="MEMBERED:attr.7">add-closed</a>  &amp;  <a href="numbers.html#NK1" title="NUMBERS:NK.1">NAT</a>  is  <a href="membered.html#V6" title="MEMBERED:attr.6">natural-membered</a>  )</span><br/>

<span class="kw">thus </span><a NAME="E1:110_7_1"/>
(  not  <a href="numbers.html#NK1" title="NUMBERS:NK.1">NAT</a>  is  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>  &amp;  <a href="numbers.html#NK1" title="NUMBERS:NK.1">NAT</a>  is  <a href="membered.html#V7" title="MEMBERED:attr.7">add-closed</a>  &amp;  <a href="numbers.html#NK1" title="NUMBERS:NK.1">NAT</a>  is  <a href="membered.html#V6" title="MEMBERED:attr.6">natural-membered</a>  )
 ; <a class="txt" onmouseover="tooltip.show('hs',this)" onmouseout="tooltip.hide()" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> verum</span><br/>


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