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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E38">Th28</font></span>: <a NAME="T28"><span class="comment"><font color="firebrick">:: METRIC_1:28</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">x</font>, <font color="Olive" title="b2">y</font> being    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of 2 holds  <a href="metric_1.html#K11" title="METRIC_1:func.11">Set_to_zero</a> <a href="binop_1.html#K1" title="BINOP_1:func.1">.</a> (<font color="Olive" title="b1">x</font>,<font color="Olive" title="b2">y</font>) <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <a href="metric_1.html#K11" title="METRIC_1:func.11">Set_to_zero</a> <a href="binop_1.html#K1" title="BINOP_1:func.1">.</a> (<font color="Olive" title="b2">y</font>,<font color="Olive" title="b1">x</font>)</div></div>
