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<b>let </b><font color="Maroon">c<sub>1</sub></font> be  non <a href="struct_0.html#V3">empty</a>  <a href="pre_topc.html#L1">TopStruct</a> ;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font> be    <a href="topgrp_1.html#M1" target="_self">Homeomorphism</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>



<b>thus </b><a NAME="E1:46"/>
<font color="Maroon">c<sub>2</sub></font> <a href="tops_2.html#K2">/"</a>  <a href="tops_2.html#NR1" target="_self">is_homeomorphism</a> 
 ; <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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