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<div><span class="kw">theorem </span><a NAME="T19"><span class="comment"><font color="firebrick">:: YELLOW20:19</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">A</font>, <font color="Olive" title="b2">B</font> being    <a href="altcat_1.html#L2" title="ALTCAT_1:struct.2">AltCatStr</a>   st <font color="Olive" title="b1">A</font>,<font color="Olive" title="b2">B</font> <a href="yellow20.html#R1" title="YELLOW20:pred.1">have_the_same_composition</a>  holds <br/> <a href="yellow20.html#K2" title="YELLOW20:func.2">Intersect</a> (<font color="Olive" title="b1">A</font>,<font color="Olive" title="b2">B</font>) <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="yellow20.html#K2" title="YELLOW20:func.2">Intersect</a> (<font color="Olive" title="b2">B</font>,<font color="Olive" title="b1">A</font>)</div></div>
