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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E19">Th23</font></span>: <a NAME="T23"><span class="comment"><font color="firebrick">:: BCIALG_1:23</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">X</font> being   <a href="bcialg_1.html#NM1" title="BCIALG_1:NM.1">BCI-algebra</a> holds   <a href="struct_0.html#K4" title="STRUCT_0:func.4">0.</a> <font color="Olive" title="b1">X</font> <a href="tarski.html#R2" title="TARSKI:pred.2">in</a>  <a href="bcialg_1.html#K5" title="BCIALG_1:func.5">AtomSet</a> <font color="Olive" title="b1">X</font></div></div>
