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<b>consider </b><font color="Maroon">c<sub>1</sub></font> being  <a href="lattices.html#V3">strict</a> <a href="lattices.html#NM8">B_Lattice</a>;<br/>
<a NAME="E2:85_1_1"/>
( <font color="Maroon">c<sub>1</sub></font> is   <a href="lattices.html#NM4">0_Lattice</a> &amp; <font color="Maroon">c<sub>1</sub></font> is   <a href="filter_0.html#NM2">I_Lattice</a> )
 
<b>by </b><i><a class="ref" href="filter_0.html#T40">FILTER_0:40</a></i>;<br/>
<a NAME="E3:85_1_1"/><b>then </b>
<font color="Maroon">c<sub>1</sub></font> is   <a href="lattice2.html#NM2">H_Lattice</a>
 
<b>by </b><i><a class="ref" href="lattice2.html#D6" target="_self">Def6</a></i>;<br/>
<b>hence </b><a NAME="E4:85_1_1"/>
ex <font color="Olive">b<sub>1</sub></font> being  <a href="lattices.html#NM1">Lattice</a> st <br/>( <font color="Olive">b<sub>1</sub></font> is <a href="lattice2.html#V1" target="_self">Heyting</a> &amp; <font color="Olive">b<sub>1</sub></font> is <a href="lattices.html#V3">strict</a> )
 ;<br/>


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