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<b>let </b><font color="Maroon" title="c1">x</font> be    <a href="subset_1.html#M2" title="SUBSET_1:mode.2">Element</a> of  <a href="circcomb.html#K9" title="CIRCCOMB:func.9">BOOLEAN</a> ;<br/>

<b>thus </b><a NAME="E1:5"/>
<a href="gfacirc1.html#K1" title="GFACIRC1:func.1">inv1</a>  <a href="funct_1.html#K1" title="FUNCT_1:func.1">.</a> <span class="p1"><a href="facirc_1.html#K5" title="FACIRC_1:func.5">&lt;*</a><span class="default"><font color="Maroon" title="c1">x</font></span><a href="facirc_1.html#K5" title="FACIRC_1:func.5">*&gt;</a></span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="margrel1.html#K9" title="MARGREL1:func.9">'not'</a> <font color="Maroon" title="c1">x</font>
 <b>by </b><i><a class="ref" href="gfacirc1.html#D1" target="_self" title="GFACIRC1:def.1">Def1</a></i>;<br/>

<b>thus </b><a href="gfacirc1.html#K1" title="GFACIRC1:func.1">inv1</a>  <a href="funct_1.html#K1" title="FUNCT_1:func.1">.</a> <span class="p1"><a href="facirc_1.html#K5" title="FACIRC_1:func.5">&lt;*</a><span class="default"><font color="Maroon" title="c1">x</font></span><a href="facirc_1.html#K5" title="FACIRC_1:func.5">*&gt;</a></span> = 
 <a href="margrel1.html#K9" title="MARGREL1:func.9">'not'</a> <span class="p1">(<span class="default"><font color="Maroon" title="c1">x</font> <a href="margrel1.html#K10" title="MARGREL1:func.10">'&amp;'</a> <font color="Maroon" title="c1">x</font></span>)</span>
<b>by </b><i><a class="ref" href="gfacirc1.html#D1" target="_self" title="GFACIRC1:def.1">Def1</a></i>
<br/>.= 
<a href="twoscomp.html#K5" title="TWOSCOMP:func.5">nand2</a>  <a href="funct_1.html#K1" title="FUNCT_1:func.1">.</a> <span class="p1"><a href="facirc_1.html#K6" title="FACIRC_1:func.6">&lt;*</a><span class="default"><font color="Maroon" title="c1">x</font>,<font color="Maroon" title="c1">x</font></span><a href="facirc_1.html#K6" title="FACIRC_1:func.6">*&gt;</a></span>
<b>by </b><i><a class="ref" href="twoscomp.html#D4" title="TWOSCOMP:def.4">TWOSCOMP:def 4</a></i>
;<br/>

<b>thus </b><a href="gfacirc1.html#K1" title="GFACIRC1:func.1">inv1</a>  <a href="funct_1.html#K1" title="FUNCT_1:func.1">.</a> <span class="p1"><a href="facirc_1.html#K5" title="FACIRC_1:func.5">&lt;*</a><span class="default"><a href="numbers.html#K6" title="NUMBERS:func.6">0</a> </span><a href="facirc_1.html#K5" title="FACIRC_1:func.5">*&gt;</a></span> = 
 <a href="margrel1.html#K9" title="MARGREL1:func.9">'not'</a> <a href="margrel1.html#K7" title="MARGREL1:func.7">FALSE</a> 
<b>by </b><i><a class="ref" href="gfacirc1.html#D1" target="_self" title="GFACIRC1:def.1">Def1</a></i>
<br/>.= 
1

;<br/>

<b>thus </b><a href="gfacirc1.html#K1" title="GFACIRC1:func.1">inv1</a>  <a href="funct_1.html#K1" title="FUNCT_1:func.1">.</a> <span class="p1"><a href="facirc_1.html#K5" title="FACIRC_1:func.5">&lt;*</a><span class="default">1</span><a href="facirc_1.html#K5" title="FACIRC_1:func.5">*&gt;</a></span> = 
 <a href="margrel1.html#K9" title="MARGREL1:func.9">'not'</a> <a href="margrel1.html#K8" title="MARGREL1:func.8">TRUE</a> 
<b>by </b><i><a class="ref" href="gfacirc1.html#D1" target="_self" title="GFACIRC1:def.1">Def1</a></i>
<br/>.= 
 <a href="numbers.html#K6" title="NUMBERS:func.6">0</a> 

;<br/>


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