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<b>let </b><font color="Maroon">U0</font> be   <a href="unialg_1.html#NM2">Universal_Algebra</a>;<br/><b>let </b><font color="Maroon">U1</font> be   <a href="unialg_1.html#NM2">Universal_Algebra</a>;<br/>



<b>assume </b><a NAME="E1:21"/><i><font color="Green">E20</font></i>: 
<font color="Maroon">U0</font> is    <a href="unialg_2.html#M3" target="_self">SubAlgebra</a> of <font color="Maroon">U1</font>
 ;<br/>

<b>then reconsider </b><font color="Maroon">A</font> = the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">U0</font> as  non <a href="xboole_0.html#V1">empty</a> <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">U1</font> <b>by </b><i/>;<br/>
<a NAME="E3:21"/>
( the <a href="unialg_1.html#U1">charact</a> of <font color="Maroon">U0</font> <a href="hidden.html#R1">=</a>  <a href="unialg_2.html#K3" target="_self">Opers</a> <font color="Maroon">U1</font>,<font color="Maroon">A</font> &amp; <font color="Maroon">A</font> is <a href="unialg_2.html#V1" target="_self">opers_closed</a> )
 
<b>by </b><i>, </i>;<br/>
<b>hence </b><a NAME="E4:21"/>
 <a href="finseq_1.html#K4">dom</a> the <a href="unialg_1.html#U1">charact</a> of <font color="Maroon">U0</font> <a href="hidden.html#R1">=</a>  <a href="finseq_1.html#K4">dom</a> the <a href="unialg_1.html#U1">charact</a> of <font color="Maroon">U1</font>
 <b>by </b><i/>;<br/>


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