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<b>let </b><font color="Maroon" title="c6">S</font>, <font color="Maroon" title="c7">T</font> be  non <a href="struct_0.html#V2" title="STRUCT_0:attr.2">empty</a> <a href="pre_topc.html#NM1" title="PRE_TOPC:NM.1">TopSpace</a>;<br/><b>let </b><font color="Maroon" title="c8">A</font> be   <a href="struct_0.html#NM2" title="STRUCT_0:NM.2">Subset</a> of <font color="Maroon" title="c6">S</font>;<br/><b>let </b><font color="Maroon" title="c9">B</font> be   <a href="struct_0.html#NM2" title="STRUCT_0:NM.2">Subset</a> of <font color="Maroon" title="c7">T</font>;<br/><b>let </b><font color="Maroon" title="c10">N</font> be    <a href="connsp_2.html#M2" title="CONNSP_2:mode.2">a_neighborhood</a> of <font color="Maroon" title="c8">A</font>;<br/>







<b>assume </b><b>that </b><br/><a NAME="E1:11"/><i><font color="Green" title="E17">A1</font></i>: 
 <a href="pre_topc.html#G1" title="PRE_TOPC:aggr.1">TopStruct</a>(# the <a href="struct_0.html#U1" title="STRUCT_0:sel.1">carrier</a> of <font color="Maroon" title="c6">S</font>,the <a href="pre_topc.html#U1" title="PRE_TOPC:sel.1">topology</a> of <font color="Maroon" title="c6">S</font> #) <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="pre_topc.html#G1" title="PRE_TOPC:aggr.1">TopStruct</a>(# the <a href="struct_0.html#U1" title="STRUCT_0:sel.1">carrier</a> of <font color="Maroon" title="c7">T</font>,the <a href="pre_topc.html#U1" title="PRE_TOPC:sel.1">topology</a> of <font color="Maroon" title="c7">T</font> #)
 <b>and </b><br/><a NAME="E2:11"/><i><font color="Green" title="E18">A2</font></i>: 
<font color="Maroon" title="c8">A</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c9">B</font>
 ;<br/>

<b>reconsider </b><font color="Maroon" title="c11">M</font> = <font color="Maroon" title="c10">N</font> as   <a href="struct_0.html#NM2" title="STRUCT_0:NM.2">Subset</a> of <font color="Maroon" title="c7">T</font> <b>by </b><i><a class="txt" href="topalg_5.html#E1:11"><i><font color="Green" title="E17">A1</font></i></a></i>;<br/>
<a NAME="E4:11"/><i><font color="Green" title="E19">A3</font></i>: 
 <a href="tops_1.html#K1" title="TOPS_1:func.1">Int</a> <font color="Maroon" title="c11">M</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="tops_1.html#K1" title="TOPS_1:func.1">Int</a> <font color="Maroon" title="c10">N</font>
 
<b>by </b><i><a class="txt" href="topalg_5.html#E1:11"><i><font color="Green" title="E17">A1</font></i></a>, <a class="ref" href="tops_3.html#T77" title="TOPS_3:th.77">TOPS_3:77</a></i>;<br/>
<a NAME="E5:11"/>
<font color="Maroon" title="c8">A</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a>  <a href="tops_1.html#K1" title="TOPS_1:func.1">Int</a> <font color="Maroon" title="c10">N</font>
 
<b>by </b><i><a class="ref" href="connsp_2.html#D2" title="CONNSP_2:def.2">CONNSP_2:def 2</a></i>;<br/>
<b>hence </b><a NAME="E6:11"/>
<font color="Maroon" title="c10">N</font> is    <a href="connsp_2.html#M2" title="CONNSP_2:mode.2">a_neighborhood</a> of <font color="Maroon" title="c9">B</font>
 <b>by </b><i><a class="txt" href="topalg_5.html#E2:11"><i><font color="Green" title="E18">A2</font></i></a>, <a class="txt" href="topalg_5.html#E4:11"><i><font color="Green" title="E19">A3</font></i></a>, <a class="ref" href="connsp_2.html#D2" title="CONNSP_2:def.2">CONNSP_2:def 2</a></i>;<br/>


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