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<div><span class="kw">theorem </span><a NAME="T20"><span class="comment"><font color="firebrick">:: BCIIDEAL:20</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="bcialg_1.html#K4" title="BCIALG_1:func.4">BCK-part</a> <font color="Olive" title="b1">X</font> is    <a href="bciideal.html#M2" title="BCIIDEAL:mode.2">p-ideal</a> of <font color="Olive" title="b1">X</font></div></div>
