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<div><span class="kw">theorem </span><a NAME="T21"><span class="comment"><font color="firebrick">:: COUNTERS:21</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">N</font>, <font color="Olive" title="b2">M</font>, <font color="Olive" title="b3">K</font> being   <a href="counters.html#NM1" title="COUNTERS:NM.1">ExtNat</a> holds  <span class="p1">(<span class="default"><font color="Olive" title="b3">K</font> <a href="xxreal_3.html#K1" title="XXREAL_3:func.1">+</a> <font color="Olive" title="b2">M</font></span>)</span> <a href="xxreal_3.html#K1" title="XXREAL_3:func.1">+</a> <font color="Olive" title="b1">N</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Olive" title="b3">K</font> <a href="xxreal_3.html#K1" title="XXREAL_3:func.1">+</a> <span class="p1">(<span class="default"><font color="Olive" title="b2">M</font> <a href="xxreal_3.html#K1" title="XXREAL_3:func.1">+</a> <font color="Olive" title="b1">N</font></span>)</span> <span class="kw">by</span> <span class="lab"><a class="ref" href="xxreal_3.html#T29" onmouseover="rs('xxreal_3/T29')" onmouseout="rh()">XXREAL_3:29</a></span>;<br/></div></div>
