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<a NAME="E1:1_1_1"/>
( <font color="Maroon" title="c1">x</font> <a href="xboolean.html#K8" title="XBOOLEAN:func.8">'nand'</a> <font color="Maroon" title="c2">y</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="margrel1.html#K7" title="MARGREL1:func.7">FALSE</a>  or <font color="Maroon" title="c1">x</font> <a href="xboolean.html#K8" title="XBOOLEAN:func.8">'nand'</a> <font color="Maroon" title="c2">y</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="margrel1.html#K8" title="MARGREL1:func.8">TRUE</a>  )
 
<b>by </b><i><a class="ref" href="xboolean.html#D3" title="XBOOLEAN:def.3">XBOOLEAN:def 3</a></i>;<br/>
<b>hence </b><a NAME="E2:1_1_1"/>
<font color="Maroon" title="c1">x</font> <a href="xboolean.html#K8" title="XBOOLEAN:func.8">'nand'</a> <font color="Maroon" title="c2">y</font> is    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="margrel1.html#K6" title="MARGREL1:func.6">BOOLEAN</a> 
 ; <a class="txt" onclick="hs(this)" href="javascript:()"><i><font color="Red">::  thesis: </font></i></a><span class="hide"> verum</span><br/>


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