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<a NAME="E1:19_2_1"/>
 <a href="ordinal5.html#K4" title="ORDINAL5:func.4">Sum^</a> <span class="p1">(<span class="default"><font color="Maroon" title="c1">A</font> <a href="ordinal4.html#K1" title="ORDINAL4:func.1">^</a> <font color="Maroon" title="c2">B</font></span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1">(<span class="default"><a href="ordinal5.html#K4" title="ORDINAL5:func.4">Sum^</a> <font color="Maroon" title="c1">A</font></span>)</span> <a href="ordinal2.html#K10" title="ORDINAL2:func.10">+^</a> <span class="p1">(<span class="default"><a href="ordinal5.html#K4" title="ORDINAL5:func.4">Sum^</a> <font color="Maroon" title="c2">B</font></span>)</span>
 
<span class="kw">by</span> <span class="lab"><a class="ref" href="ordinal7.html#T11" target="_self" onmouseover="rs('ordinal7/T11')" onmouseout="rh()">Th24</a></span>;<br/>
<span class="kw">hence </span><a NAME="E2:19_2_1"/>
 not  <a href="ordinal5.html#K4" title="ORDINAL5:func.4">Sum^</a> <span class="p1">(<span class="default"><font color="Maroon" title="c1">A</font> <a href="ordinal4.html#K1" title="ORDINAL4:func.1">^</a> <font color="Maroon" title="c2">B</font></span>)</span> is  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a> 
 ; <a class="txt" onmouseover="tooltip.show('hs',this)" onmouseout="tooltip.hide()" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> verum</span><br/>


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