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<a NAME="E1:12_1_1"/>
 <a href="pboole.html#K1">[0]</a> <font color="Maroon">c<sub>1</sub></font> <a href="pboole.html#R2">c=</a> <font color="Maroon">c<sub>2</sub></font>
 
<b>by </b><i><a class="ref" href="mboolean.html#T5">MBOOLEAN:5</a></i>;<br/>
<a NAME="E2:12_1_1"/><b>then </b>
 <a href="pboole.html#K1">[0]</a> <font color="Maroon">c<sub>1</sub></font> <a href="pboole.html#R1">in</a>  <a href="mssubfam.html#K7">bool</a> <font color="Maroon">c<sub>2</sub></font>
 
<b>by </b><i><a class="ref" href="mboolean.html#T1">MBOOLEAN:1</a></i>;<br/>
<b>then reconsider </b><font color="Maroon">c<sub>3</sub></font> =  <a href="pboole.html#K1">[0]</a> <font color="Maroon">c<sub>1</sub></font> as    <a href="pboole.html#M2">Element</a> of  <a href="mssubfam.html#K7">bool</a> <font color="Maroon">c<sub>2</sub></font> <b>by </b><i><a class="ref" href="mssubfam.html#T11">MSSUBFAM:11</a></i>;<br/>
<b>take </b>
<font color="Maroon">c<sub>3</sub></font>
;<br/>

<b>thus </b><a NAME="E4:12_1_1"/>
( <font color="Maroon">c<sub>3</sub></font> is <a href="relat_1.html#V3">empty-yielding</a> &amp; <font color="Maroon">c<sub>3</sub></font> is <a href="pre_circ.html#V1">locally-finite</a> )
 ;<br/>


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