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<b>let </b><font color="Maroon" title="c1">S</font> be  non <a href="struct_0.html#V3" title="STRUCT_0:attr.3">empty</a> non <a href="pencil_1.html#V3" title="PENCIL_1:attr.3">void</a> <a href="pencil_1.html#V6" title="PENCIL_1:attr.6">identifying_close_blocks</a>  <a href="pre_topc.html#L1" title="PRE_TOPC:struct.1">TopStruct</a> ;<br/>

<b>assume </b><a NAME="E1:4"/>
<font color="Maroon" title="c1">S</font> is <a href="pencil_1.html#V10" title="PENCIL_1:attr.10">strongly_connected</a>
 ;<br/>

<a NAME="E2:4"/><b>then </b>
( <font color="Maroon" title="c1">S</font> is <a href="pencil_1.html#V10" title="PENCIL_1:attr.10">strongly_connected</a> &amp; <font color="Maroon" title="c1">S</font> is <a href="pencil_1.html#V8" title="PENCIL_1:attr.8">without_isolated_points</a> )
 
<b>by </b><i><a class="ref" href="pencil_3.html#T3" target="_self" title="PENCIL_3:th.3">Th3</a></i>;<br/>
<b>hence </b><a NAME="E3:4"/>
<font color="Maroon" title="c1">S</font> is <a href="pencil_1.html#V9" title="PENCIL_1:attr.9">connected</a>
 <b>by </b><i><a class="ref" href="pencil_1.html#T28" title="PENCIL_1:th.28">PENCIL_1:28</a></i>;<br/>


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