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<b>let </b><font color="Maroon" title="c1">AFV</font> be   <a href="afvect0.html#NM1" title="AFVECT0:NM.1">WeakAffVect</a>;<br/><b>let </b><font color="Maroon" title="c2">a</font>, <font color="Maroon" title="c3">b</font>, <font color="Maroon" title="c4">c</font>, <font color="Maroon" title="c5">p</font> be   <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c1">AFV</font>;<br/>









<div><i><font color="Green" title="E27">A1</font></i>: <a class="txt" onclick="hs2(this)" href="javascript:()" title="41_1"><b>now </b></a><div class="add"><b>assume </b><a NAME="E1:41_1"/>
 <a href="afvect0.html#R2" title="AFVECT0:pred.2">Mid</a> <font color="Maroon" title="c2">a</font>,<font color="Maroon" title="c3">b</font>,<font color="Maroon" title="c4">c</font>
 ;<br/><a NAME="E2:41_1"/><b>then </b>
<font color="Maroon" title="c2">a</font>,<font color="Maroon" title="c3">b</font> <a href="analoaf.html#R2" title="ANALOAF:pred.2">//</a> <font color="Maroon" title="c3">b</font>,<font color="Maroon" title="c4">c</font>
 <b>by </b><i><a class="ref" href="afvect0.html#D3" target="_self" title="AFVECT0:def.3">Def3</a></i>;<br/><a NAME="E3:41_1"/><b>then </b>
 <a href="afvect0.html#K1" title="AFVECT0:func.1">PSym</a> <font color="Maroon" title="c5">p</font>,<font color="Maroon" title="c2">a</font>, <a href="afvect0.html#K1" title="AFVECT0:func.1">PSym</a> <font color="Maroon" title="c5">p</font>,<font color="Maroon" title="c3">b</font> <a href="analoaf.html#R2" title="ANALOAF:pred.2">//</a>  <a href="afvect0.html#K1" title="AFVECT0:func.1">PSym</a> <font color="Maroon" title="c5">p</font>,<font color="Maroon" title="c3">b</font>, <a href="afvect0.html#K1" title="AFVECT0:func.1">PSym</a> <font color="Maroon" title="c5">p</font>,<font color="Maroon" title="c4">c</font>
 <b>by </b><i><a class="ref" href="afvect0.html#T40" target="_self" title="AFVECT0:th.40">Th40</a></i>;<br/><b>hence </b><a NAME="E4:41_1"/>
 <a href="afvect0.html#R2" title="AFVECT0:pred.2">Mid</a>  <a href="afvect0.html#K1" title="AFVECT0:func.1">PSym</a> <font color="Maroon" title="c5">p</font>,<font color="Maroon" title="c2">a</font>, <a href="afvect0.html#K1" title="AFVECT0:func.1">PSym</a> <font color="Maroon" title="c5">p</font>,<font color="Maroon" title="c3">b</font>, <a href="afvect0.html#K1" title="AFVECT0:func.1">PSym</a> <font color="Maroon" title="c5">p</font>,<font color="Maroon" title="c4">c</font>
 <b>by </b><i><a class="ref" href="afvect0.html#D3" target="_self" title="AFVECT0:def.3">Def3</a></i>;<br/></div><b>end;</b></div>
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="41_2"><b>now </b></a><div class="add"><b>assume </b><a NAME="E1:41_2"/>
 <a href="afvect0.html#R2" title="AFVECT0:pred.2">Mid</a>  <a href="afvect0.html#K1" title="AFVECT0:func.1">PSym</a> <font color="Maroon" title="c5">p</font>,<font color="Maroon" title="c2">a</font>, <a href="afvect0.html#K1" title="AFVECT0:func.1">PSym</a> <font color="Maroon" title="c5">p</font>,<font color="Maroon" title="c3">b</font>, <a href="afvect0.html#K1" title="AFVECT0:func.1">PSym</a> <font color="Maroon" title="c5">p</font>,<font color="Maroon" title="c4">c</font>
 ;<br/><a NAME="E2:41_2"/><b>then </b>
 <a href="afvect0.html#K1" title="AFVECT0:func.1">PSym</a> <font color="Maroon" title="c5">p</font>,<font color="Maroon" title="c2">a</font>, <a href="afvect0.html#K1" title="AFVECT0:func.1">PSym</a> <font color="Maroon" title="c5">p</font>,<font color="Maroon" title="c3">b</font> <a href="analoaf.html#R2" title="ANALOAF:pred.2">//</a>  <a href="afvect0.html#K1" title="AFVECT0:func.1">PSym</a> <font color="Maroon" title="c5">p</font>,<font color="Maroon" title="c3">b</font>, <a href="afvect0.html#K1" title="AFVECT0:func.1">PSym</a> <font color="Maroon" title="c5">p</font>,<font color="Maroon" title="c4">c</font>
 <b>by </b><i><a class="ref" href="afvect0.html#D3" target="_self" title="AFVECT0:def.3">Def3</a></i>;<br/><a NAME="E3:41_2"/><b>then </b>
<font color="Maroon" title="c2">a</font>,<font color="Maroon" title="c3">b</font> <a href="analoaf.html#R2" title="ANALOAF:pred.2">//</a> <font color="Maroon" title="c3">b</font>,<font color="Maroon" title="c4">c</font>
 <b>by </b><i><a class="ref" href="afvect0.html#T40" target="_self" title="AFVECT0:th.40">Th40</a></i>;<br/><b>hence </b><a NAME="E4:41_2"/>
 <a href="afvect0.html#R2" title="AFVECT0:pred.2">Mid</a> <font color="Maroon" title="c2">a</font>,<font color="Maroon" title="c3">b</font>,<font color="Maroon" title="c4">c</font>
 <b>by </b><i><a class="ref" href="afvect0.html#D3" target="_self" title="AFVECT0:def.3">Def3</a></i>;<br/></div><b>end;</b></div>
<b>hence </b><a NAME="E3:41"/>
(  <a href="afvect0.html#R2" title="AFVECT0:pred.2">Mid</a> <font color="Maroon" title="c2">a</font>,<font color="Maroon" title="c3">b</font>,<font color="Maroon" title="c4">c</font> iff  <a href="afvect0.html#R2" title="AFVECT0:pred.2">Mid</a>  <a href="afvect0.html#K1" title="AFVECT0:func.1">PSym</a> <font color="Maroon" title="c5">p</font>,<font color="Maroon" title="c2">a</font>, <a href="afvect0.html#K1" title="AFVECT0:func.1">PSym</a> <font color="Maroon" title="c5">p</font>,<font color="Maroon" title="c3">b</font>, <a href="afvect0.html#K1" title="AFVECT0:func.1">PSym</a> <font color="Maroon" title="c5">p</font>,<font color="Maroon" title="c4">c</font> )
 <b>by </b><i><a class="txt" href="afvect0.html#E1:41"><i><font color="Green" title="E27">A1</font></i></a></i>;<br/>


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