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<b>let </b><font color="Maroon" title="c1">SAS</font> be   <a href="semi_af1.html#NM1" title="SEMI_AF1:NM.1">Semi_Affine_Space</a>;<br/><b>let </b><font color="Maroon" title="c2">o</font>, <font color="Maroon" title="c3">b</font>, <font color="Maroon" title="c4">d</font>, <font color="Maroon" title="c5">a</font>, <font color="Maroon" title="c6">c</font> be   <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c1">SAS</font>;<br/>











<b>assume </b><a NAME="E1:103"/>
( ( <font color="Maroon" title="c2">o</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c3">b</font> or <font color="Maroon" title="c2">o</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c4">d</font> ) &amp;  <a href="semi_af1.html#R4" title="SEMI_AF1:pred.4">trap</a> <font color="Maroon" title="c5">a</font>,<font color="Maroon" title="c3">b</font>,<font color="Maroon" title="c6">c</font>,<font color="Maroon" title="c4">d</font>,<font color="Maroon" title="c2">o</font> )
 ;<br/>

<a NAME="E2:103"/><b>then </b>
( ( <font color="Maroon" title="c2">o</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c3">b</font> &amp;  <a href="semi_af1.html#R4" title="SEMI_AF1:pred.4">trap</a> <font color="Maroon" title="c6">c</font>,<font color="Maroon" title="c4">d</font>,<font color="Maroon" title="c5">a</font>,<font color="Maroon" title="c3">b</font>,<font color="Maroon" title="c2">o</font> ) or ( <font color="Maroon" title="c2">o</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c4">d</font> &amp;  <a href="semi_af1.html#R4" title="SEMI_AF1:pred.4">trap</a> <font color="Maroon" title="c5">a</font>,<font color="Maroon" title="c3">b</font>,<font color="Maroon" title="c6">c</font>,<font color="Maroon" title="c4">d</font>,<font color="Maroon" title="c2">o</font> ) )
 
<b>by </b><i><a class="ref" href="semi_af1.html#T121" target="_self" title="SEMI_AF1:th.121">Th121</a></i>;<br/>
<b>hence </b><a NAME="E3:103"/>
( <font color="Maroon" title="c2">o</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c3">b</font> &amp; <font color="Maroon" title="c2">o</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c4">d</font> )
 <b>by </b><i><a class="ref" href="semi_af1.html#T122" target="_self" title="SEMI_AF1:th.122">Th122</a></i>;<br/>


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