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<div><span class="kw">theorem </span><a NAME="T18"><span class="comment"><font color="firebrick">:: BCIALG_1:18</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 <br/> ( <font color="Olive" title="b1">X</font> is  <a href="bcialg_1.html#V6" title="BCIALG_1:attr.6">being_K</a>  iff <font color="Olive" title="b1">X</font> is   <a href="bcialg_1.html#NM2" title="BCIALG_1:NM.2">BCK-algebra</a> )</div></div>
