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<b>take </b>
 <a href="pre_topc.html#K2">[#]</a> <font color="Maroon">T</font>
;<br/>

<b>thus </b><a NAME="E1:73_1_1"/>
( not  <a href="pre_topc.html#K2">[#]</a> <font color="Maroon">T</font> is <a href="xboole_0.html#V1">empty</a> &amp;  <a href="pre_topc.html#K2">[#]</a> <font color="Maroon">T</font> is <a href="pre_topc.html#V3">open</a> &amp;  <a href="pre_topc.html#K2">[#]</a> <font color="Maroon">T</font> is <a href="pre_topc.html#V4">closed</a> &amp;  <a href="pre_topc.html#K2">[#]</a> <font color="Maroon">T</font> is <a href="connsp_1.html#V2">connected</a> )
 <b>by </b><i><a class="ref" href="connsp_1.html#T28">CONNSP_1:28</a></i>;<br/>


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