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<a NAME="E1:17_2_1"/>
 ex <font color="Olive" title="b1">S</font> being  <a href="kurato_2.html#NM1" title="KURATO_2:NM.1">SetSequence</a> of <font color="Maroon" title="c1">T</font> st <br/>( <font color="Olive" title="b1">S</font> is <a href="compl_sp.html#V4" title="COMPL_SP:attr.4">open</a> &amp; <font color="Olive" title="b1">S</font> is <a href="compl_sp.html#V5" title="COMPL_SP:attr.5">closed</a> &amp; ( not <font color="Maroon" title="c1">T</font> is <a href="struct_0.html#V2" title="STRUCT_0:attr.2">empty</a> implies <font color="Olive" title="b1">S</font> is <a href="relat_1.html#V2" title="RELAT_1:attr.2">non-empty</a> ) )
 
<b>by </b><i><a class="txt" href="compl_sp.html#E14"><i><font color="Green" title="E13">LM</font></i></a></i>;<br/>
<b>hence </b><a NAME="E2:17_2_1"/>
 ex <font color="Olive">b<sub>1</sub></font> being  <a href="kurato_2.html#NM1" title="KURATO_2:NM.1">SetSequence</a> of <font color="Maroon" title="c1">T</font> st <br/>( <font color="Olive">b<sub>1</sub></font> is <a href="compl_sp.html#V5" title="COMPL_SP:attr.5">closed</a> &amp; <font color="Olive">b<sub>1</sub></font> is <a href="relat_1.html#V2" title="RELAT_1:attr.2">non-empty</a> )
 ;<br/>


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