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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="margrel1.html#V2" target="_self">boolean</a>  <a href="hidden.html#M1">set</a> ;<br/>





<div><i><font color="Green">E15</font></i>: <a class="txt" onclick="hs2(this)" href="javascript:()" title="43_1"><b>now </b></a><div class="add"><b>assume </b><a NAME="E1:43_1"/><i><font color="Green">E16</font></i>: 
<font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K8" target="_self">TRUE</a> 
 ;<br/><div><i><font color="Green">E17</font></i>: <a class="txt" onclick="hs2(this)" href="javascript:()" title="43_1_1"><b>now </b></a><div class="add"><b>assume </b><a NAME="E1:43_1_1"/>
<font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K8" target="_self">TRUE</a> 
 ;<br/><a NAME="E2:43_1_1"/><i><font color="Green">E18</font></i>: 
( <font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K8" target="_self">TRUE</a>  implies <font color="Maroon">c<sub>1</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font> )
 <b>by </b><i><a class="txt" href="margrel1.html#E1:43_1"><i><font color="Green">E16</font></i></a></i>;<br/><div><a class="txt" onclick="hs2(this)" href="javascript:()" title="43_1_1_1"><b>now </b></a><div class="add"><b>assume </b><a NAME="E1:43_1_1_1"/><i><font color="Green">E19</font></i>: 
<font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K7" target="_self">FALSE</a> 
 ;<br/><a NAME="E2:43_1_1_1"/><b>then </b>
<font color="Maroon">c<sub>2</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K7" target="_self">FALSE</a> 
 <b>by </b><i><a class="ref" href="margrel1.html#T45" target="_self">Th45</a></i>;<br/><a NAME="E3:43_1_1_1"/><b>then </b>
<font color="Maroon">c<sub>1</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K7" target="_self">FALSE</a> 
 <b>by </b><i><a class="ref" href="margrel1.html#T45" target="_self">Th45</a></i>;<br/><b>hence </b><a NAME="E4:43_1_1_1"/>
<font color="Maroon">c<sub>1</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font>
 <b>by </b><i><a class="txt" href="margrel1.html#E1:43_1_1_1"><i><font color="Green">E19</font></i></a>, <a class="ref" href="margrel1.html#T45" target="_self">Th45</a></i>;<br/></div><b>end;</b></div><b>hence </b><a NAME="E4:43_1_1"/>
<font color="Maroon">c<sub>1</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font>
 <b>by </b><i><a class="txt" href="margrel1.html#E2:43_1_1"><i><font color="Green">E18</font></i></a>, <a class="ref" href="margrel1.html#T39" target="_self">Th39</a></i>;<br/></div><b>end;</b></div><div><a class="txt" onclick="hs2(this)" href="javascript:()" title="43_1_2"><b>now </b></a><div class="add"><b>assume </b><a NAME="E1:43_1_2"/><i><font color="Green">E18</font></i>: 
<font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K7" target="_self">FALSE</a> 
 ;<br/><div><i><font color="Green">E19</font></i>: <a class="txt" onclick="hs2(this)" href="javascript:()" title="43_1_2_1"><b>now </b></a><div class="add"><b>assume </b><a NAME="E1:43_1_2_1"/>
<font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K8" target="_self">TRUE</a> 
 ;<br/><a NAME="E2:43_1_2_1"/>
<font color="Maroon">c<sub>2</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K7" target="_self">FALSE</a> 
 <b>by </b><i><a class="txt" href="margrel1.html#E1:43_1_2"><i><font color="Green">E18</font></i></a>, <a class="ref" href="margrel1.html#T45" target="_self">Th45</a></i>;<br/><a NAME="E3:43_1_2_1"/><b>then </b><i><font color="Green">E20</font></i>: 
<font color="Maroon">c<sub>1</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K7" target="_self">FALSE</a> 
 <b>by </b><i><a class="ref" href="margrel1.html#T45" target="_self">Th45</a></i>;<br/><a NAME="E4:43_1_2_1"/>
<font color="Maroon">c<sub>1</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K7" target="_self">FALSE</a> 
 <b>by </b><i><a class="txt" href="margrel1.html#E1:43_1_2"><i><font color="Green">E18</font></i></a>, <a class="ref" href="margrel1.html#T45" target="_self">Th45</a></i>;<br/><b>hence </b><a NAME="E5:43_1_2_1"/>
<font color="Maroon">c<sub>1</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font>
 <b>by </b><i><a class="txt" href="margrel1.html#E3:43_1_2_1"><i><font color="Green">E20</font></i></a>, <a class="ref" href="margrel1.html#T45" target="_self">Th45</a></i>;<br/></div><b>end;</b></div><div><a class="txt" onclick="hs2(this)" href="javascript:()" title="43_1_2_2"><b>now </b></a><div class="add"><b>assume </b><a NAME="E1:43_1_2_2"/><i><font color="Green">E20</font></i>: 
<font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K7" target="_self">FALSE</a> 
 ;<br/><a NAME="E2:43_1_2_2"/><b>then </b>
<font color="Maroon">c<sub>2</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K7" target="_self">FALSE</a> 
 <b>by </b><i><a class="ref" href="margrel1.html#T45" target="_self">Th45</a></i>;<br/><a NAME="E3:43_1_2_2"/><b>then </b>
<font color="Maroon">c<sub>1</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K7" target="_self">FALSE</a> 
 <b>by </b><i><a class="ref" href="margrel1.html#T45" target="_self">Th45</a></i>;<br/><b>hence </b><a NAME="E4:43_1_2_2"/>
<font color="Maroon">c<sub>1</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font>
 <b>by </b><i><a class="txt" href="margrel1.html#E1:43_1_2_2"><i><font color="Green">E20</font></i></a>, <a class="ref" href="margrel1.html#T45" target="_self">Th45</a></i>;<br/></div><b>end;</b></div><b>hence </b><a NAME="E4:43_1_2"/>
<font color="Maroon">c<sub>1</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font>
 <b>by </b><i><a class="txt" href="margrel1.html#E2:43_1_2"><i><font color="Green">E19</font></i></a>, <a class="ref" href="margrel1.html#T39" target="_self">Th39</a></i>;<br/></div><b>end;</b></div><b>hence </b><a NAME="E4:43_1"/>
<font color="Maroon">c<sub>1</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font>
 <b>by </b><i><a class="txt" href="margrel1.html#E2:43_1"><i><font color="Green">E17</font></i></a>, <a class="ref" href="margrel1.html#T39" target="_self">Th39</a></i>;<br/></div><b>end;</b></div>
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="43_2"><b>now </b></a><div class="add"><b>assume </b><a NAME="E1:43_2"/><i><font color="Green">E16</font></i>: 
<font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K7" target="_self">FALSE</a> 
 ;<br/><a NAME="E2:43_2"/><b>then </b><i><font color="Green">E17</font></i>: 
<font color="Maroon">c<sub>1</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K7" target="_self">FALSE</a> 
 <b>by </b><i><a class="ref" href="margrel1.html#T45" target="_self">Th45</a></i>;<br/><a NAME="E3:43_2"/>
<font color="Maroon">c<sub>1</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K7" target="_self">FALSE</a> 
 <b>by </b><i><a class="txt" href="margrel1.html#E1:43_2"><i><font color="Green">E16</font></i></a>, <a class="ref" href="margrel1.html#T45" target="_self">Th45</a></i>;<br/><b>hence </b><a NAME="E4:43_2"/>
<font color="Maroon">c<sub>1</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font>
 <b>by </b><i><a class="txt" href="margrel1.html#E2:43_2"><i><font color="Green">E17</font></i></a>, <a class="ref" href="margrel1.html#T45" target="_self">Th45</a></i>;<br/></div><b>end;</b></div>
<b>hence </b><a NAME="E3:43"/>
<font color="Maroon">c<sub>1</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="margrel1.html#K10" target="_self">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font>
 <b>by </b><i><a class="txt" href="margrel1.html#E1:43"><i><font color="Green">E15</font></i></a>, <a class="ref" href="margrel1.html#T39" target="_self">Th39</a></i>;<br/>


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