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<b>let </b><font color="Maroon">k</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">d</font> be  non <a href="xboole_0.html#V1">zero</a>  <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/><b>let </b><font color="Maroon">G</font> be    <a href="chain_1.html#M1" target="_self">Grating</a> of <font color="Maroon">d</font>;<br/><b>let </b><font color="Maroon">A</font> be   <a href="chain_1.html#NM3">Cell</a> of <font color="Maroon">k</font>,<font color="Maroon">G</font>;<br/><b>let </b><font color="Maroon">B</font> be   <a href="chain_1.html#NM3">Cell</a> of <span class="p1">(<span class="default"><font color="Maroon">k</font> <a href="nat_1.html#K1">+</a> 1</span>)</span>,<font color="Maroon">G</font>;<br/>









<b>defpred </b><font color="Maroon">S<sub>1</sub></font>[   <a href="hidden.html#M1">set</a> ] <b>means </b><font color="Maroon">A</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">a<sub>1</sub></font>;<br/>
<a NAME="E1:76"/><i><font color="Green">E37</font></i>: 
 <a href="chain_1.html#K10" target="_self">star</a> <font color="Maroon">A</font> <a href="hidden.html#R1">=</a> <span class="p1">{<span class="default"> <font color="Olive">B'</font> where <font color="Olive">B'</font> is   <a href="chain_1.html#NM3">Cell</a> of <span class="p1">(<span class="default"><font color="Maroon">k</font> <a href="nat_1.html#K1">+</a> 1</span>)</span>,<font color="Maroon">G</font> : <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">B'</font>] </span>}</span> 
 
;<br/>
<b>thus </b><a NAME="E2:76"/>
( <font color="Maroon">B</font> <a href="hidden.html#R2">in</a>  <a href="chain_1.html#K10" target="_self">star</a> <font color="Maroon">A</font> iff <font color="Maroon">S<sub>1</sub></font>[<font color="Maroon">B</font>] )
 <b>from </b><i><a class="ref" href="lmod_7.html#S7">LMOD_7:sch 7</a>();</i><br/>


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