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<b>thus </b><a NAME="E1:44_1_1"/>
 <a href="grcat_1.html#K7">id</a> <font color="Maroon">c<sub>1</sub></font> <a href="tops_2.html#NR1" target="_self">is_homeomorphism</a> 
 <b>by </b><i><a class="ref" href="topgrp_1.html#T20" target="_self">Th20</a></i>; <i><font color="Red">:: according to </font></i><a class="ref" href="topgrp_1.html#D3" target="_self">TOPGRP_1:def 3</a><br/>


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