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 <a href="pre_topc.html#K2">[#]</a> <a href="topalg_2.html#K3">R^1</a>  = 
 <a href="numbers.html#K1">REAL</a> 
<b>by </b><i><a class="ref" href="topmetr.html#T24">TOPMETR:24</a></i>
<br/>.= 
 <a href="subset_1.html#K2">[#]</a> <a href="numbers.html#K1">REAL</a> 

<br/>.= 
 <a href="toprealb.html#K5" target="_self">R^1</a> <span class="p1">(<span class="default"><a href="subset_1.html#K2">[#]</a> <a href="numbers.html#K1">REAL</a> </span>)</span>

;<br/>
<b>hence </b><a NAME="E2:23"/>
<a href="topalg_2.html#K3">R^1</a>  <a href="pre_topc.html#K3">|</a> <span class="p1">(<span class="default"><a href="toprealb.html#K5" target="_self">R^1</a> <span class="p2">(<span class="default"><a href="subset_1.html#K2">[#]</a> <a href="numbers.html#K1">REAL</a> </span>)</span></span>)</span> <a href="hidden.html#R1">=</a>  <a href="topalg_2.html#K3">R^1</a> 
 <b>by </b><i><a class="ref" href="pre_topc.html#D10">PRE_TOPC:def 10</a></i>;<br/>


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