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<div><span class="kw">theorem </span><a NAME="T73"><span class="comment"><font color="firebrick">:: CLASSES5:73</font></span><br/></a><div class="add">(  <a href="classes5.html#K11" title="CLASSES5:func.11">op0</a> <a href="numbers.html#K5" title="NUMBERS:func.5">0</a> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="funct_5.html#K5" title="FUNCT_5:func.5">op0</a>  &amp;  <a href="classes5.html#K12" title="CLASSES5:func.12">op1</a> <a href="numbers.html#K5" title="NUMBERS:func.5">0</a> <a href="funct_2.html#R2" title="FUNCT_2:pred.2">=</a>  <a href="funct_5.html#K8" title="FUNCT_5:func.8">op1</a>  &amp;  <a href="classes5.html#K13" title="CLASSES5:func.13">op2</a> <a href="numbers.html#K5" title="NUMBERS:func.5">0</a> <a href="binop_1.html#R8" title="BINOP_1:pred.8">=</a>  <a href="funct_5.html#K9" title="FUNCT_5:func.9">op2</a>  ) <span class="kw">by</span> <span class="lab"><a class="ref" href="funct_5.html#D5" onmouseover="rs('funct_5/D5')" onmouseout="rh()">FUNCT_5:def 5</a>, <a class="ref" href="funct_5.html#D6" onmouseover="rs('funct_5/D6')" onmouseout="rh()">FUNCT_5:def 6</a></span>;<br/></div></div>
