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<b>let </b><font color="Maroon">c<sub>2</sub></font> be    <a href="subset_1.html#M1">Element</a> of  <a href="coh_sp.html#K3" target="_self">CSp</a> <font color="Maroon">c<sub>1</sub></font>;<br/>

<a NAME="E1:22_1_1"/>
<font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <font color="Olive">b<sub>1</sub></font> where B is   <a href="setfam_1.html#NM1">Subset-Family</a> of <font color="Maroon">c<sub>1</sub></font> : <font color="Olive">b<sub>1</sub></font> is   <a href="coh_sp.html#NM1">Coherence_Space</a> </span>}</span> 
 
;<br/>
<b>then consider </b><font color="Maroon">c<sub>3</sub></font> being   <a href="setfam_1.html#NM1">Subset-Family</a> of <font color="Maroon">c<sub>1</sub></font><b> such that </b><br/><a NAME="E3:22_1_1"/><i><font color="Green">E10</font></i>: 
( <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>3</sub></font> &amp; <font color="Maroon">c<sub>3</sub></font> is   <a href="coh_sp.html#NM1">Coherence_Space</a> )
 ;<br/>
<b>thus </b><a NAME="E4:22_1_1"/>
( <font color="Maroon">c<sub>2</sub></font> is <a href="classes1.html#V1">subset-closed</a> &amp; <font color="Maroon">c<sub>2</sub></font> is <a href="coh_sp.html#V1" target="_self">binary_complete</a> &amp; not <font color="Maroon">c<sub>2</sub></font> is <a href="xboole_0.html#V1">empty</a> )
 <b>by </b><i><a class="txt" href="coh_sp.html#E3:22_1_1"><i><font color="Green">E10</font></i></a></i>;<br/>


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