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<b>let </b><font color="Maroon">n</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/><b>let </b><font color="Maroon">RAS</font> be    <a href="midsp_3.html#M2" target="_self">ReperAlgebra</a> of <font color="Maroon">n</font>;<br/><b>let </b><font color="Maroon">a</font> be   <a href="pre_topc.html#NM2">Point</a> of <font color="Maroon">RAS</font>;<br/><b>let </b><font color="Maroon">b</font> be   <a href="pre_topc.html#NM2">Point</a> of <font color="Maroon">RAS</font>;<br/><b>let </b><font color="Maroon">W</font> be   <a href="midsp_2.html#NM1">ATLAS</a> of <font color="Maroon">RAS</font>;<br/><b>let </b><font color="Maroon">x</font> be   <a href="midsp_3.html#NM3">Tuple</a> of <span class="p1">(<span class="default"><font color="Maroon">n</font> <a href="nat_1.html#K1">+</a> 1</span>)</span>,<font color="Maroon">W</font>;<br/>











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<font color="Maroon">RAS</font> <a href="midsp_3.html#NR1" target="_self">is_invariance</a> 
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:44"/>
 <a href="midsp_3.html#K8" target="_self">Phi</a> <font color="Maroon">a</font>,<font color="Maroon">x</font> <a href="hidden.html#R1">=</a>  <a href="midsp_3.html#K8" target="_self">Phi</a> <font color="Maroon">b</font>,<font color="Maroon">x</font>
 <b>by </b><i/>;<br/>


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