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<a NAME="E1:81_1_1"/>
<font color="Maroon" title="c2">c2</font> <a href="ordinal1.html#R1" title="ORDINAL1:pred.1">c=</a> <font color="Maroon" title="c1">c1</font> <a href="card_2.html#K1" title="CARD_2:func.1">+`</a> <font color="Maroon" title="c2">c2</font>
 
<span class="kw">by</span> <span class="lab"><a class="ref" href="card_2.html#T94" onmouseover="rs('card_2/T94')" onmouseout="rh()">CARD_2:94</a></span>;<br/>
<span class="kw">hence </span><a NAME="E2:81_1_1"/>
 not <font color="Maroon" title="c1">c1</font> <a href="card_2.html#K1" title="CARD_2:func.1">+`</a> <font color="Maroon" title="c2">c2</font> 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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