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<b>let </b><font color="Maroon">c<sub>1</sub></font>, <font color="Maroon">c<sub>2</sub></font>, <font color="Maroon">c<sub>3</sub></font> be    <a href="subset_1.html#M1">Element</a> of  <a href="circcomb.html#K10">BOOLEAN</a> ;<br/>

<b>thus </b><a href="gfacirc1.html#K1" target="_self">inv1</a>  <a href="funct_1.html#K1">.</a> <span class="p1"><a href="facirc_1.html#K5">&lt;*</a><span class="default"><span class="p2">(<span class="default"><a href="gfacirc1.html#K4" target="_self">xor2c</a>  <a href="funct_1.html#K1">.</a> <span class="p3"><a href="facirc_1.html#K6">&lt;*</a><span class="default"><span class="p4">(<span class="default"><a href="twoscomp.html#K16">xor2b</a>  <a href="funct_1.html#K1">.</a> <span class="p5"><a href="facirc_1.html#K6">&lt;*</a><span class="default"><font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font></span><a href="facirc_1.html#K6">*&gt;</a></span></span>)</span>,<font color="Maroon">c<sub>3</sub></font></span><a href="facirc_1.html#K6">*&gt;</a></span></span>)</span></span><a href="facirc_1.html#K5">*&gt;</a></span> = 
<a href="gfacirc1.html#K1" target="_self">inv1</a>  <a href="funct_1.html#K1">.</a> <span class="p1"><a href="facirc_1.html#K5">&lt;*</a><span class="default"><span class="p2">(<span class="default"><a href="gfacirc1.html#K4" target="_self">xor2c</a>  <a href="funct_1.html#K1">.</a> <span class="p3"><a href="facirc_1.html#K6">&lt;*</a><span class="default"><span class="p4">(<span class="default"><span class="p5">(<span class="default"><a href="margrel1.html#K11">'not'</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> <a href="binarith.html#K4">'xor'</a> <span class="p5">(<span class="default"><a href="margrel1.html#K11">'not'</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span>,<font color="Maroon">c<sub>3</sub></font></span><a href="facirc_1.html#K6">*&gt;</a></span></span>)</span></span><a href="facirc_1.html#K5">*&gt;</a></span>
<b>by </b><i><a class="ref" href="twoscomp.html#D15">TWOSCOMP:def 15</a></i>
<br/>.= 
<a href="gfacirc1.html#K1" target="_self">inv1</a>  <a href="funct_1.html#K1">.</a> <span class="p1"><a href="facirc_1.html#K5">&lt;*</a><span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><span class="p4">(<span class="default"><a href="margrel1.html#K11">'not'</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> <a href="binarith.html#K4">'xor'</a> <span class="p4">(<span class="default"><a href="margrel1.html#K11">'not'</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="binarith.html#K4">'xor'</a> <span class="p3">(<span class="default"><a href="margrel1.html#K11">'not'</a> <font color="Maroon">c<sub>3</sub></font></span>)</span></span>)</span></span><a href="facirc_1.html#K5">*&gt;</a></span>
<b>by </b><i><a class="ref" href="gfacirc1.html#D4" target="_self">Def4</a></i>
<br/>.= 
 <a href="margrel1.html#K11">'not'</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="margrel1.html#K11">'not'</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> <a href="binarith.html#K4">'xor'</a> <span class="p3">(<span class="default"><a href="margrel1.html#K11">'not'</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="binarith.html#K4">'xor'</a> <span class="p2">(<span class="default"><a href="margrel1.html#K11">'not'</a> <font color="Maroon">c<sub>3</sub></font></span>)</span></span>)</span>
<b>by </b><i><a class="ref" href="gfacirc1.html#D1" target="_self">Def1</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="binarith.html#K4">'xor'</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="binarith.html#K4">'xor'</a> <font color="Maroon">c<sub>3</sub></font>
<b>by </b><i><a class="ref" href="gfacirc1.html#T11" target="_self">Th11</a></i>
<br/>.= 
<a href="twoscomp.html#K14">xor2</a>  <a href="funct_1.html#K1">.</a> <span class="p1"><a href="facirc_1.html#K6">&lt;*</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="binarith.html#K4">'xor'</a> <font color="Maroon">c<sub>2</sub></font></span>)</span>,<font color="Maroon">c<sub>3</sub></font></span><a href="facirc_1.html#K6">*&gt;</a></span>
<b>by </b><i><a class="ref" href="twoscomp.html#D13">TWOSCOMP:def 13</a></i>
<br/>.= 
<a href="twoscomp.html#K14">xor2</a>  <a href="funct_1.html#K1">.</a> <span class="p1"><a href="facirc_1.html#K6">&lt;*</a><span class="default"><span class="p2">(<span class="default"><a href="twoscomp.html#K14">xor2</a>  <a href="funct_1.html#K1">.</a> <span class="p3"><a href="facirc_1.html#K6">&lt;*</a><span class="default"><font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font></span><a href="facirc_1.html#K6">*&gt;</a></span></span>)</span>,<font color="Maroon">c<sub>3</sub></font></span><a href="facirc_1.html#K6">*&gt;</a></span>
<b>by </b><i><a class="ref" href="twoscomp.html#D13">TWOSCOMP:def 13</a></i>
;<br/>


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