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<b>let </b><font color="Maroon" title="c1">p</font> be  <a href="xboolean.html#V1" title="XBOOLEAN:attr.1">boolean</a>  <a href="ordinal1.html#NM1" title="ORDINAL1:NM.1">number</a> ;<br/>

<a NAME="E1:139"/>
( <font color="Maroon" title="c1">p</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="xboolean.html#K1" title="XBOOLEAN:func.1">FALSE</a>  or <font color="Maroon" title="c1">p</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="xboolean.html#K2" title="XBOOLEAN:func.2">TRUE</a>  )
 
<b>by </b><i><a class="ref" href="xboolean.html#D3" target="_self" title="XBOOLEAN:def.3">Def3</a></i>;<br/>
<b>hence </b><a NAME="E2:139"/>
<font color="Maroon" title="c1">p</font> <a href="xboolean.html#K8" title="XBOOLEAN:func.8">'nand'</a> <span class="p1">(<span class="default"><a href="xboolean.html#K3" title="XBOOLEAN:func.3">'not'</a> <font color="Maroon" title="c1">p</font></span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="xboolean.html#K2" title="XBOOLEAN:func.2">TRUE</a> 
 ;<br/>


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