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<b>consider </b><font color="Maroon">c<sub>2</sub></font> being  non <a href="xboole_0.html#V1">empty</a> <a href="finsub_1.html#V2">cap-closed</a> <a href="prob_1.html#V1">compl-closed</a> <a href="setfam_1.html#NM1">Subset-Family</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>
<b>take </b>
<font color="Maroon">c<sub>2</sub></font>
;<br/>

<b>thus </b><a NAME="E2:24_1_1"/>
( not <font color="Maroon">c<sub>2</sub></font> is <a href="xboole_0.html#V1">empty</a> &amp; <font color="Maroon">c<sub>2</sub></font> is <a href="prob_1.html#V1">compl-closed</a> &amp; <font color="Maroon">c<sub>2</sub></font> is <a href="finsub_1.html#V2">cap-closed</a> )
 ;<br/>


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