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<b>let </b><font color="Maroon">S</font> be    <a href="pre_topc.html#L1">TopStruct</a> ;<br/>

<b>take </b>
 <a href="grcat_1.html#K7">id</a> <font color="Maroon">S</font>
; <i><font color="Red">:: according to </font></i><a class="ref" href="t_0topsp.html#D1">T_0TOPSP:def 1</a><br/>

<b>thus </b><a NAME="E1:6"/>
 <a href="grcat_1.html#K7">id</a> <font color="Maroon">S</font> is <a href="tops_2.html#V3">being_homeomorphism</a>
 ;<br/>


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