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<b>let </b><font color="Maroon">c<sub>1</sub></font> be  <a href="unialg_2.html#V2" target="_self">with_const_op</a> <a href="unialg_1.html#NM2">Universal_Algebra</a>;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font>, <font color="Maroon">c<sub>3</sub></font> be    <a href="unialg_2.html#M3" target="_self">SubAlgebra</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>



<b>consider </b><font color="Maroon">c<sub>4</sub></font> being    <a href="struct_0.html#M1">Element</a> of  <a href="unialg_2.html#K6" target="_self">Constants</a> <font color="Maroon">c<sub>1</sub></font>;<br/>
<a NAME="E2:36"/>
(  <a href="unialg_2.html#K6" target="_self">Constants</a> <font color="Maroon">c<sub>1</sub></font> is  non <a href="xboole_0.html#V1">empty</a> <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">c<sub>2</sub></font> &amp;  <a href="unialg_2.html#K6" target="_self">Constants</a> <font color="Maroon">c<sub>1</sub></font> is  non <a href="xboole_0.html#V1">empty</a> <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">c<sub>3</sub></font> )
 
<b>by </b><i><a class="ref" href="unialg_2.html#T18" target="_self">Th18</a></i>;<br/>
<a NAME="E3:36"/><b>then </b><i><font color="Green">E23</font></i>: 
 <a href="unialg_2.html#K6" target="_self">Constants</a> <font color="Maroon">c<sub>1</sub></font> <a href="tarski.html#R1">c=</a> the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">c<sub>2</sub></font> <a href="xboole_0.html#K3">/\</a> the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">c<sub>3</sub></font>
 
<b>by </b><i><a class="ref" href="xboole_1.html#T19">XBOOLE_1:19</a></i>;<br/>
<a NAME="E4:36"/>
<font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R2">in</a>  <a href="unialg_2.html#K6" target="_self">Constants</a> <font color="Maroon">c<sub>1</sub></font>
 
;<br/>
<b>hence </b><a NAME="E5:36"/>
the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">c<sub>2</sub></font> <a href="subset_1.html#R2">meets</a> the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">c<sub>3</sub></font>
 <b>by </b><i><a class="txt" href="unialg_2.html#E3:36"><i><font color="Green">E23</font></i></a>, <a class="ref" href="xboole_0.html#T4">XBOOLE_0:4</a></i>;<br/>


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