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<div><span class="kw">theorem </span><a NAME="T95"><span class="comment"><font color="firebrick">:: CARD_3:95</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">X</font>, <font color="Olive" title="b2">Y</font> being    <a href="hidden.html#M2" title="HIDDEN:mode.2">set</a>   st <font color="Olive" title="b1">X</font> is  <a href="card_3.html#V4" title="CARD_3:attr.4">countable</a>  holds <br/><font color="Olive" title="b1">X</font> <a href="subset_1.html#K6" title="SUBSET_1:func.6">\</a> <font color="Olive" title="b2">Y</font> is  <a href="card_3.html#V4" title="CARD_3:attr.4">countable</a>  ;<br/></div></div>
