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<b>let </b><font color="Maroon" title="c1">L</font> be  non <a href="struct_0.html#V3" title="STRUCT_0:attr.3">empty</a> <a href="lattices.html#V10" title="LATTICES:attr.10">Lattice-like</a> <a href="lattices.html#V11" title="LATTICES:attr.11">distributive</a> <a href="lattices.html#V13" title="LATTICES:attr.13">lower-bounded</a> <a href="lattices.html#V14" title="LATTICES:attr.14">upper-bounded</a> <a href="lattices.html#V16" title="LATTICES:attr.16">complemented</a> <a href="lattices.html#V17" title="LATTICES:attr.17">Boolean</a> <a href="sheffer1.html#V3" title="SHEFFER1:attr.3">distributive'</a>  <a href="lattices.html#L3" title="LATTICES:struct.3">LattStr</a> ;<br/>

<a NAME="E1:31"/><i><font color="Green" title="E31">A1</font></i>: 
<font color="Maroon" title="c1">L</font> is <a href="sheffer1.html#V2" title="SHEFFER1:attr.2">lower-bounded'</a>
 
<b>by </b><i><a class="ref" href="sheffer1.html#T16" target="_self" title="SHEFFER1:th.16">Th16</a></i>;<br/>
<b>set </b><font color="Maroon" title="c2">Y</font> =  <a href="lattices.html#K5" title="LATTICES:func.5">Bottom</a> <font color="Maroon" title="c1">L</font>;<br/>
<a NAME="E2:31"/>
for <font color="Olive" title="b1">a</font> being  <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c1">L</font> holds <br/> ( <span class="p1">(<span class="default"><a href="lattices.html#K5" title="LATTICES:func.5">Bottom</a> <font color="Maroon" title="c1">L</font></span>)</span> <a href="lattices.html#K3" title="LATTICES:func.3">"\/"</a> <font color="Olive" title="b1">a</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Olive" title="b1">a</font> &amp; <font color="Olive" title="b1">a</font> <a href="lattices.html#K3" title="LATTICES:func.3">"\/"</a> <span class="p1">(<span class="default"><a href="lattices.html#K5" title="LATTICES:func.5">Bottom</a> <font color="Maroon" title="c1">L</font></span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Olive" title="b1">a</font> )
 
<b>by </b><i><a class="ref" href="lattices.html#T39" title="LATTICES:th.39">LATTICES:39</a></i>;<br/>
<b>hence </b><a NAME="E3:31"/>
 <a href="lattices.html#K5" title="LATTICES:func.5">Bottom</a> <font color="Maroon" title="c1">L</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="sheffer1.html#K2" title="SHEFFER1:func.2">Bot'</a> <font color="Maroon" title="c1">L</font>
 <b>by </b><i><a class="txt" href="sheffer1.html#E1:31"><i><font color="Green" title="E31">A1</font></i></a>, <a class="ref" href="sheffer1.html#D4" target="_self" title="SHEFFER1:def.4">Def4</a></i>;<br/>


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