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<b>let </b><font color="Maroon" title="c1">T</font> be    <a href="pre_topc.html#L1" title="PRE_TOPC:struct.1">TopStruct</a> ;<br/><b>let </b><font color="Maroon" title="c2">f</font> be    <a href="topgrp_1.html#M3" title="TOPGRP_1:mode.3">Homeomorphism</a> of <font color="Maroon" title="c1">T</font>;<br/>



<b>thus </b><a NAME="E1:48"/>
<font color="Maroon" title="c2">f</font> <a href="tops_2.html#K2" title="TOPS_2:func.2">/"</a>  <a href="tops_2.html#NR1" title="TOPS_2:NR.1">is_homeomorphism</a> 
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="topgrp_1.html#D4" target="_self" title="TOPGRP_1:def.4">TOPGRP_1:def 4</a><br/>


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