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<b>let </b><font color="Maroon" title="c1">E</font> be    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ;<br/>

<b>assume </b><a NAME="E1:8"/>
<font color="Maroon" title="c1">E</font> is <a href="intpro_1.html#V7" title="INTPRO_1:attr.7">MC-closed</a>
 ;<br/>

<a NAME="E2:8"/><b>then </b>
<font color="Maroon" title="c1">E</font> is <a href="intpro_1.html#V1" title="INTPRO_1:attr.1">with_FALSUM</a>
 
<b>by </b><i><a class="ref" href="intpro_1.html#D7" target="_self" title="INTPRO_1:def.7">Def7</a></i>;<br/>
<b>hence </b><a NAME="E3:8"/>
not <font color="Maroon" title="c1">E</font> is <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>
 <b>by </b><i><a class="ref" href="intpro_1.html#D1" target="_self" title="INTPRO_1:def.1">Def1</a></i>;<br/>


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