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<div><span class="kw">theorem </span><a NAME="T26"><span class="comment"><font color="firebrick">:: MBOOLEAN:26</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">I</font> being    <a href="hidden.html#M2" title="HIDDEN:mode.2">set</a> <br/>  for <font color="Olive" title="b2">A</font>, <font color="Olive" title="b3">B</font> being   <a href="pboole.html#NM1" title="PBOOLE:NM.1">ManySortedSet</a> of <font color="Olive" title="b1">I</font>  st <font color="Olive" title="b2">A</font> <a href="pboole.html#R2" title="PBOOLE:pred.2">c=</a> <font color="Olive" title="b3">B</font> holds <br/> <a href="mboolean.html#K2" title="MBOOLEAN:func.2">union</a> <font color="Olive" title="b2">A</font> <a href="pboole.html#R2" title="PBOOLE:pred.2">c=</a>  <a href="mboolean.html#K2" title="MBOOLEAN:func.2">union</a> <font color="Olive" title="b3">B</font></div></div>
