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<div><span class="kw">theorem </span><a NAME="T20"><span class="comment"><font color="firebrick">:: FILTER_1:20</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">B</font> being   <a href="lattices.html#NM8" title="LATTICES:NM.8">B_Lattice</a><br/>  for <font color="Olive" title="b2">FB</font> being   <a href="filter_0.html#NM1" title="FILTER_0:NM.1">Filter</a> of <font color="Olive" title="b1">B</font> holds  <font color="Olive" title="b1">B</font> <a href="filter_1.html#K4" title="FILTER_1:func.4">/\/</a> <font color="Olive" title="b2">FB</font> is   <a href="lattices.html#NM8" title="LATTICES:NM.8">B_Lattice</a></div></div>
