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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="relat_2.html#V8">(F2)</a> <a href="armstrng.html#V3" target="_self">(F1)</a> <a href="armstrng.html#V4" target="_self">(F3)</a> <a href="armstrng.html#V5" target="_self">(F4)</a> <a href="armstrng.html#NM2">Dependency-set</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="E2:54_1_1"/>
<font color="Maroon">c<sub>2</sub></font> is <a href="armstrng.html#V6" target="_self">full_family</a>
 <b>by </b><i><a class="ref" href="armstrng.html#D15" target="_self">Def15</a></i>;<br/>


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