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<div><span class="kw">theorem </span><a NAME="T12"><span class="comment"><font color="firebrick">:: POLYDIFF:12</font></span><br/></a><div class="add"><span class="p1">(<span class="default"><a href="partfun1.html#K6" title="PARTFUN1:func.6">id</a> <a href="numbers.html#K1" title="NUMBERS:func.1">REAL</a></span>)</span> <a href="polydiff.html#K1" title="POLYDIFF:func.1">`|</a>  <a href="funct_2.html#R1" title="FUNCT_2:pred.1">=</a> <a href="numbers.html#K1" title="NUMBERS:func.1">REAL</a> <a href="funcop_1.html#K8" title="FUNCOP_1:func.8">--&gt;</a> 1</div></div>
