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<b>let </b><font color="Maroon">CS</font> be   <a href="transgeo.html#NM1">CongrSpace</a>;<br/><b>let </b><font color="Maroon">f</font> be   <a href="funct_2.html#NM2">Permutation</a> of the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">CS</font>;<br/>



<b>assume </b><a NAME="E1:35"/>
<font color="Maroon">f</font> <a href="transgeo.html#R3" target="_self">is_DIL_of</a> <font color="Maroon">CS</font>
 ;<br/>

<a NAME="E2:35"/><b>then </b>
( <font color="Maroon">f</font> <a href="transgeo.html#R1" target="_self">is_FormalIz_of</a> the <a href="analoaf.html#U1">CONGR</a> of <font color="Maroon">CS</font> &amp; the <a href="analoaf.html#U1">CONGR</a> of <font color="Maroon">CS</font> <a href="relat_2.html#R3">is_symmetric_in</a> <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default">the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">CS</font>,the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">CS</font></span><a href="zfmisc_1.html#K2">:]</a></span> )
 
<b>by </b><i>, </i>;<br/>
<a NAME="E3:35"/><b>then </b>
<font color="Maroon">f</font> <a href="funct_2.html#K2">"</a>  <a href="transgeo.html#R1" target="_self">is_FormalIz_of</a> the <a href="analoaf.html#U1">CONGR</a> of <font color="Maroon">CS</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E4:35"/>
<font color="Maroon">f</font> <a href="funct_2.html#K2">"</a>  <a href="transgeo.html#R3" target="_self">is_DIL_of</a> <font color="Maroon">CS</font>
 <b>by </b><i/>;<br/>


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