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<span class="kw">take </span>
the <a href="pre_topc.html#U1" title="PRE_TOPC:sel.1">topology</a> of <font color="Maroon" title="c1">X</font>
; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="Red">::  thesis: </font></span></a><span class="hide"> ( the <a href="pre_topc.html#U1" title="PRE_TOPC:sel.1">topology</a> of <font color="Maroon" title="c1">X</font> is  <a href="tops_2.html#V1" title="TOPS_2:attr.1">open</a>  &amp; the <a href="pre_topc.html#U1" title="PRE_TOPC:sel.1">topology</a> of <font color="Maroon" title="c1">X</font> is  <a href="cantor_1.html#V2" title="CANTOR_1:attr.2">quasi_prebasis</a>  )</span><br/>

<span class="kw">thus </span><a NAME="E1:25_3_1"/>
( the <a href="pre_topc.html#U1" title="PRE_TOPC:sel.1">topology</a> of <font color="Maroon" title="c1">X</font> is  <a href="tops_2.html#V1" title="TOPS_2:attr.1">open</a>  &amp; the <a href="pre_topc.html#U1" title="PRE_TOPC:sel.1">topology</a> of <font color="Maroon" title="c1">X</font> is  <a href="cantor_1.html#V2" title="CANTOR_1:attr.2">quasi_prebasis</a>  )
 ; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="Red">::  thesis: </font></span></a><span class="hide"> verum</span><br/>


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