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<b>let </b><font color="Maroon">I</font> be  non <a href="struct_0.html#V3">empty</a> non <a href="vectsp_1.html#V10">degenerated</a>  <a href="vectsp_1.html#L2">multLoopStr_0</a> ;<br/><b>let </b><font color="Maroon">u</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="quofield.html#K1" target="_self">Q.</a> <font color="Maroon">I</font>;<br/>



<b>consider </b><font color="Maroon">a</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">I</font>, <font color="Maroon">b</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">I</font><b> such that </b><br/><a NAME="E2:4"/><i><font color="Green">E20</font></i>: 
( <font color="Maroon">u</font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><font color="Maroon">a</font>,<font color="Maroon">b</font></span><a href="domain_1.html#K1">]</a></span> &amp; <font color="Maroon">b</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="rlvect_1.html#K1">0.</a> <font color="Maroon">I</font> )
 <b>by </b><i/>;<br/>
<b>thus </b><a NAME="E3:4"/>
<font color="Maroon">u</font> <a href="domain_1.html#K3">`2</a>  <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="rlvect_1.html#K1">0.</a> <font color="Maroon">I</font>
 <b>by </b><i>, <a class="ref" href="mcart_1.html#T7">MCART_1:7</a></i>;<br/>


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