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<div><span class="kw">theorem </span><a NAME="T106"><span class="comment"><font color="firebrick">:: CARD_3:106</font></span><br/></a><div class="add"> <a href="card_3.html#K10" title="CARD_3:func.10">product"</a> <span class="p1"><a href="tarski.html#K1" title="TARSKI:func.1">{</a><span class="default"><a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a></span><a href="tarski.html#K1" title="TARSKI:func.1">}</a></span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> </div></div>
