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<b>let </b><font color="Maroon">c<sub>4</sub></font> be    <a href="pre_topc.html#M1">SubSpace</a> of <font color="Maroon">c<sub>3</sub></font>;<br/><b>let </b><font color="Maroon">c<sub>5</sub></font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>4</sub></font>; <i><font color="Red">:: according to </font></i><a class="ref" href="monoid_0.html#D2">MONOID_0:def 2</a><br/>



<a NAME="E1:30_1_1"/><i><font color="Green">E13</font></i>: 
the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">c<sub>4</sub></font> is   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">c<sub>3</sub></font>
 
<b>by </b><i><a class="ref" href="tsep_1.html#T1">TSEP_1:1</a></i>;<br/>
<div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="30_1_1_1"><b>per </b></a><a class="txt" onclick="hs(this)" href="javascript:()"><b>cases </b></a><span class="hide"><a NAME="E1:30_1_1_1"/>
(  not the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">c<sub>4</sub></font> is <a href="xboole_0.html#V1">empty</a> or the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">c<sub>4</sub></font> is <a href="xboole_0.html#V1">empty</a> )
 </span>;<br/><div class="add"><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="30_1_1_1_1"><b>suppose </b></a><a NAME="E1:30_1_1_1_1"/>
not the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">c<sub>4</sub></font> is <a href="xboole_0.html#V1">empty</a>
 ;<br/><div class="add"><a NAME="E2:30_1_1_1_1"/><b>then </b>
<font color="Maroon">c<sub>5</sub></font> <a href="hidden.html#R2">in</a> the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">c<sub>4</sub></font>
 ;<br/><b>then reconsider </b><font color="Maroon">c<sub>6</sub></font> = <font color="Maroon">c<sub>5</sub></font> as   <a href="pre_topc.html#NM2">Point</a> of <font color="Maroon">c<sub>3</sub></font> <b>by </b><i><a class="txt" href="topreala.html#E1:30_1_1"><i><font color="Green">E13</font></i></a></i>;<br/><a NAME="E4:30_1_1_1_1"/>
<font color="Maroon">c<sub>6</sub></font> is   <a href="finseq_1.html#NM1">FinSequence</a>
 ;<br/><b>hence </b><a NAME="E5:30_1_1_1_1"/>
<font color="Maroon">c<sub>5</sub></font> is    <a href="hidden.html#M1">set</a> 
 ;<br/></div><b>end;</b></div><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="30_1_1_1_2"><b>suppose </b></a><a NAME="E1:30_1_1_1_2"/>
the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">c<sub>4</sub></font> is <a href="xboole_0.html#V1">empty</a>
 ;<br/><div class="add"><b>hence </b><a NAME="E2:30_1_1_1_2"/>
<font color="Maroon">c<sub>5</sub></font> is    <a href="hidden.html#M1">set</a> 
 <b>by </b><i><a class="ref" href="subset_1.html#D2">SUBSET_1:def 2</a></i>;<br/></div><b>end;</b></div></div><b>end;</b></div>

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