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<b>take </b>
 <a href="topreal1.html#K2" title="TOPREAL1:func.2">R^2-unit_square</a> 
;<br/>

<b>thus </b><a NAME="E1:20_1_1"/>
( not  <a href="topreal1.html#K2" title="TOPREAL1:func.2">R^2-unit_square</a>  is <a href="sppol_1.html#V2" title="SPPOL_1:attr.2">vertical</a> &amp; not  <a href="topreal1.html#K2" title="TOPREAL1:func.2">R^2-unit_square</a>  is <a href="sppol_1.html#V1" title="SPPOL_1:attr.1">horizontal</a> &amp; not  <a href="topreal1.html#K2" title="TOPREAL1:func.2">R^2-unit_square</a>  is <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a> &amp;  <a href="topreal1.html#K2" title="TOPREAL1:func.2">R^2-unit_square</a>  is <a href="compts_1.html#V6" title="COMPTS_1:attr.6">compact</a> )
 <b>by </b><i><a class="ref" href="sppol_2.html#T63" title="SPPOL_2:th.63">SPPOL_2:63</a></i>;<br/>


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