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<b>let </b><font color="Maroon" title="c1">AS</font> be   <a href="dirort.html#NM1" title="DIRORT:NM.1">Oriented_Orthogonality_Space</a>; <a class="txt" onclick="hs(this)" href="javascript:()"><i><font color="Red">::  thesis: </font></i></a><span class="hide"> for <font color="Olive" title="b1">u</font>, <font color="Olive" title="b2">v</font>, <font color="Olive" title="b3">w</font> being  <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c1">AS</font>  ex <font color="Olive" title="b4">u1</font> being  <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c1">AS</font> st <br/>( <font color="Olive" title="b1">u</font> <a href="hidden.html#NR2" title="HIDDEN:NR.2">&lt;&gt;</a> <font color="Olive" title="b4">u1</font> &amp; ( <font color="Olive" title="b2">v</font>,<font color="Olive" title="b3">w</font> <a href="dirort.html#NR1" title="DIRORT:NR.1">'//'</a> <font color="Olive" title="b1">u</font>,<font color="Olive" title="b4">u1</font> or <font color="Olive" title="b2">v</font>,<font color="Olive" title="b3">w</font> <a href="dirort.html#NR1" title="DIRORT:NR.1">'//'</a> <font color="Olive" title="b4">u1</font>,<font color="Olive" title="b1">u</font> ) )</span><br/><b>let </b><font color="Maroon" title="c2">u</font>, <font color="Maroon" title="c3">v</font>, <font color="Maroon" title="c4">w</font> be   <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c1">AS</font>; <a class="txt" onclick="hs(this)" href="javascript:()"><i><font color="Red">::  thesis: </font></i></a><span class="hide">  ex <font color="Olive" title="b1">u1</font> being  <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c1">AS</font> st <br/>( <font color="Maroon" title="c2">u</font> <a href="hidden.html#NR2" title="HIDDEN:NR.2">&lt;&gt;</a> <font color="Olive" title="b1">u1</font> &amp; ( <font color="Maroon" title="c3">v</font>,<font color="Maroon" title="c4">w</font> <a href="dirort.html#NR1" title="DIRORT:NR.1">'//'</a> <font color="Maroon" title="c2">u</font>,<font color="Olive" title="b1">u1</font> or <font color="Maroon" title="c3">v</font>,<font color="Maroon" title="c4">w</font> <a href="dirort.html#NR1" title="DIRORT:NR.1">'//'</a> <font color="Olive" title="b1">u1</font>,<font color="Maroon" title="c2">u</font> ) )</span><br/>







<b>consider </b><font color="Maroon" title="c5">u1</font> being   <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c1">AS</font><b> such that </b><br/><a NAME="E2:10"/><i><font color="Green" title="E6">A1</font></i>: 
( <font color="Maroon" title="c2">u</font> <a href="hidden.html#NR2" title="HIDDEN:NR.2">&lt;&gt;</a> <font color="Maroon" title="c5">u1</font> &amp; <font color="Maroon" title="c2">u</font>,<font color="Maroon" title="c5">u1</font> <a href="dirort.html#NR1" title="DIRORT:NR.1">'//'</a> <font color="Maroon" title="c3">v</font>,<font color="Maroon" title="c4">w</font> )
 <b>by </b><i><a class="ref" href="dirort.html#D1" target="_self" title="DIRORT:def.1">Def1</a></i>;<br/>
<a NAME="E3:10"/>
( <font color="Maroon" title="c2">u</font> <a href="hidden.html#NR2" title="HIDDEN:NR.2">&lt;&gt;</a> <font color="Maroon" title="c5">u1</font> &amp; ( <font color="Maroon" title="c3">v</font>,<font color="Maroon" title="c4">w</font> <a href="dirort.html#NR1" title="DIRORT:NR.1">'//'</a> <font color="Maroon" title="c2">u</font>,<font color="Maroon" title="c5">u1</font> or <font color="Maroon" title="c3">v</font>,<font color="Maroon" title="c4">w</font> <a href="dirort.html#NR1" title="DIRORT:NR.1">'//'</a> <font color="Maroon" title="c5">u1</font>,<font color="Maroon" title="c2">u</font> ) )
 
<b>by </b><i><a class="txt" href="dirort.html#E2:10"><i><font color="Green" title="E6">A1</font></i></a>, <a class="ref" href="dirort.html#D1" target="_self" title="DIRORT:def.1">Def1</a></i>;<br/>
<b>hence </b><a NAME="E4:10"/>
 ex <font color="Olive" title="b1">u1</font> being  <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c1">AS</font> st <br/>( <font color="Maroon" title="c2">u</font> <a href="hidden.html#NR2" title="HIDDEN:NR.2">&lt;&gt;</a> <font color="Olive" title="b1">u1</font> &amp; ( <font color="Maroon" title="c3">v</font>,<font color="Maroon" title="c4">w</font> <a href="dirort.html#NR1" title="DIRORT:NR.1">'//'</a> <font color="Maroon" title="c2">u</font>,<font color="Olive" title="b1">u1</font> or <font color="Maroon" title="c3">v</font>,<font color="Maroon" title="c4">w</font> <a href="dirort.html#NR1" title="DIRORT:NR.1">'//'</a> <font color="Olive" title="b1">u1</font>,<font color="Maroon" title="c2">u</font> ) )
 ; <a class="txt" onclick="hs(this)" href="javascript:()"><i><font color="Red">::  thesis: </font></i></a><span class="hide"> verum</span><br/>


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