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<span class="kw">take </span>
 <a href="real_1.html#K1" title="REAL_1:func.1">-</a> 1
; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide">  <a href="real_1.html#K1" title="REAL_1:func.1">-</a> 1 is  <a href="xxreal_0.html#V3" title="XXREAL_0:attr.3">negative</a> </span><br/>

<span class="kw">thus </span><a NAME="E1:5_2_1"/>
 <a href="real_1.html#K1" title="REAL_1:func.1">-</a> 1 is  <a href="xxreal_0.html#V3" title="XXREAL_0:attr.3">negative</a> 
 <span class="kw">by</span> <span class="lab"><a class="ref" href="xxreal_0.html#D7" title="XXREAL_0:def.7">XXREAL_0:def 7</a></span>; <a class="txt" 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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