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<b>let </b><font color="Maroon">S</font> be  non <a href="struct_0.html#V3">empty</a> non <a href="msualg_1.html#V2">void</a>  <a href="msualg_1.html#L1">ManySortedSign</a> ;<br/><b>let </b><font color="Maroon">A</font> be  <a href="msualg_1.html#V5">non-empty</a>  <a href="msualg_1.html#L3">MSAlgebra</a> of <font color="Maroon">S</font>;<br/><b>let </b><font color="Maroon">C1</font> be   <a href="msualg_4.html#NM5">MSCongruence</a> of <font color="Maroon">A</font>, <font color="Maroon">C2</font> be   <a href="msualg_4.html#NM5">MSCongruence</a> of <font color="Maroon">A</font>;<br/><b>let </b><font color="Maroon">G</font> be   <a href="msualg_3.html#NM1">ManySortedFunction</a> of <span class="p1">(<span class="default"><a href="msualg_4.html#K14">QuotMSAlg</a> <font color="Maroon">A</font>,<font color="Maroon">C1</font></span>)</span>,<span class="p1">(<span class="default"><a href="msualg_4.html#K14">QuotMSAlg</a> <font color="Maroon">A</font>,<font color="Maroon">C2</font></span>)</span>;<br/>







<b>assume </b><a NAME="E1:48"/><i><font color="Green">E39</font></i>: 
for <font color="Olive">i</font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">S</font><br/> for <font color="Olive">x</font> being   <a href="subset_1.html#M1">Element</a> of the <a href="msualg_1.html#U4">Sorts</a> of <span class="p1">(<span class="default"><a href="msualg_4.html#K14">QuotMSAlg</a> <font color="Maroon">A</font>,<font color="Maroon">C1</font></span>)</span> <a href="funct_1.html#K1">.</a> <font color="Olive">i</font><br/> for <font color="Olive">xx</font> being   <a href="subset_1.html#M1">Element</a> of the <a href="msualg_1.html#U4">Sorts</a> of <font color="Maroon">A</font> <a href="funct_1.html#K1">.</a> <font color="Olive">i</font>  st <font color="Olive">x</font> <a href="hidden.html#R1">=</a>  <a href="msualg_4.html#K3">Class</a> <font color="Maroon">C1</font>,<font color="Olive">xx</font> holds <br/><span class="p1">(<span class="default"><font color="Maroon">G</font> <a href="msualg_3.html#K1">.</a> <font color="Olive">i</font></span>)</span> <a href="funct_2.html#K3">.</a> <font color="Olive">x</font> <a href="hidden.html#R1">=</a>  <a href="msualg_4.html#K3">Class</a> <font color="Maroon">C2</font>,<font color="Olive">xx</font>
 ;<br/>

<a NAME="E2:48"/><i><font color="Green">E42</font></i>: 
 <a href="msualg_4.html#K16">MSNat_Hom</a> <font color="Maroon">A</font>,<font color="Maroon">C1</font> <a href="msualg_3.html#R2">is_epimorphism</a> <font color="Maroon">A</font>, <a href="msualg_4.html#K14">QuotMSAlg</a> <font color="Maroon">A</font>,<font color="Maroon">C1</font>
 
<b>by </b><i><a class="ref" href="msualg_4.html#T3">MSUALG_4:3</a></i>;<br/>
<a NAME="E3:48"/>
 <a href="msualg_4.html#K16">MSNat_Hom</a> <font color="Maroon">A</font>,<font color="Maroon">C2</font> <a href="msualg_3.html#R2">is_epimorphism</a> <font color="Maroon">A</font>, <a href="msualg_4.html#K14">QuotMSAlg</a> <font color="Maroon">A</font>,<font color="Maroon">C2</font>
 
<b>by </b><i><a class="ref" href="msualg_4.html#T3">MSUALG_4:3</a></i>;<br/>
<a NAME="E4:48"/><b>then </b><i><font color="Green">E43</font></i>: 
 <a href="msualg_4.html#K16">MSNat_Hom</a> <font color="Maroon">A</font>,<font color="Maroon">C2</font> <a href="msualg_3.html#R1">is_homomorphism</a> <font color="Maroon">A</font>, <a href="msualg_4.html#K14">QuotMSAlg</a> <font color="Maroon">A</font>,<font color="Maroon">C2</font>
 
<b>by </b><i><a class="ref" href="msualg_3.html#D10">MSUALG_3:def 10</a></i>;<br/>
<a NAME="E5:48"/>
<font color="Maroon">G</font> <a href="msualg_3.html#K3">**</a> <span class="p1">(<span class="default"><a href="msualg_4.html#K16">MSNat_Hom</a> <font color="Maroon">A</font>,<font color="Maroon">C1</font></span>)</span> <a href="pboole.html#R6">=</a>  <a href="msualg_4.html#K16">MSNat_Hom</a> <font color="Maroon">A</font>,<font color="Maroon">C2</font>
 
<b>by </b><i>, </i>;<br/>
<b>hence </b><a NAME="E6:48"/>
<font color="Maroon">G</font> <a href="msualg_3.html#R1">is_homomorphism</a>  <a href="msualg_4.html#K14">QuotMSAlg</a> <font color="Maroon">A</font>,<font color="Maroon">C1</font>, <a href="msualg_4.html#K14">QuotMSAlg</a> <font color="Maroon">A</font>,<font color="Maroon">C2</font>
 <b>by </b><i>, , </i>; <i><font color="Red">:: according to </font></i><a class="ref" href="msualg_3.html#D10">MSUALG_3:def 10</a><br/>

<b>thus </b><a NAME="E7:48"/>
<font color="Maroon">G</font> is <a href="msualg_3.html#V2">"onto"</a>
 <b>by </b><i>, </i>;<br/>


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