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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E5">Th8</font></span>: <a NAME="T8"><span class="comment"><font color="firebrick">:: RVSUM_1:8</font></span><br/></a><div class="add"> <a href="binop_2.html#K9" title="BINOP_2:func.9">addreal</a>  is  <a href="finseqop.html#V1" title="FINSEQOP:attr.1">having_an_inverseOp</a>  <span class="kw">by</span> <span class="lab"><a class="ref" href="rvsum_1.html#T7" target="_self" onmouseover="rs('rvsum_1/T7')" onmouseout="rh()">Th7</a></span>;<br/></div></div>
