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<b>let </b><font color="Maroon">S1</font> be  non <a href="struct_0.html#V3">empty</a>  <a href="msualg_1.html#L1">ManySortedSign</a> ;<br/><b>let </b><font color="Maroon">S2</font> be  non <a href="struct_0.html#V3">empty</a>  <a href="instalg1.html#M1" target="_self">Subsignature</a> of <font color="Maroon">S1</font>;<br/>



<b>set </b><font color="Maroon">f</font> =  <a href="partfun1.html#K6">id</a> the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">S2</font>;<br/>
<b>set </b><font color="Maroon">g</font> =  <a href="partfun1.html#K6">id</a> the <a href="msualg_1.html#U1">OperSymbols</a> of <font color="Maroon">S2</font>;<br/>
<b>let </b><font color="Maroon">A1</font> be    <a href="msualg_1.html#L3">MSAlgebra</a> of <font color="Maroon">S1</font>, <font color="Maroon">A2</font> be    <a href="msualg_1.html#L3">MSAlgebra</a> of <font color="Maroon">S1</font>;<br/><b>let </b><font color="Maroon">h</font> be    <a href="pboole.html#M3">ManySortedFunction</a> of the <a href="msualg_1.html#U4">Sorts</a> of <font color="Maroon">A1</font>,the <a href="msualg_1.html#U4">Sorts</a> of <font color="Maroon">A2</font>;<br/>



<a NAME="E1:40"/><i><font color="Green">E37</font></i>: 
 <a href="partfun1.html#K6">id</a> the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">S2</font>, <a href="partfun1.html#K6">id</a> the <a href="msualg_1.html#U1">OperSymbols</a> of <font color="Maroon">S2</font> <a href="pua2mss1.html#R3">form_morphism_between</a> <font color="Maroon">S2</font>,<font color="Maroon">S1</font>
 
<b>by </b><i/>;<br/>
<b>then reconsider </b><font color="Maroon">f</font> =  <a href="partfun1.html#K6">id</a> the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">S2</font> as   <a href="funct_2.html#NM1">Function</a> of the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">S2</font>,the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">S1</font> <b>by </b><i/>;<br/>
<a NAME="E3:40"/>
( <font color="Maroon">A1</font> <a href="instalg1.html#K2" target="_self">|</a> <font color="Maroon">S2</font> <a href="hidden.html#R1">=</a> <font color="Maroon">A1</font> <a href="instalg1.html#K1" target="_self">|</a> <font color="Maroon">S2</font>,<font color="Maroon">f</font>,<span class="p1">(<span class="default"><a href="partfun1.html#K6">id</a> the <a href="msualg_1.html#U1">OperSymbols</a> of <font color="Maroon">S2</font></span>)</span> &amp; <font color="Maroon">A2</font> <a href="instalg1.html#K2" target="_self">|</a> <font color="Maroon">S2</font> <a href="hidden.html#R1">=</a> <font color="Maroon">A2</font> <a href="instalg1.html#K1" target="_self">|</a> <font color="Maroon">S2</font>,<font color="Maroon">f</font>,<span class="p1">(<span class="default"><a href="partfun1.html#K6">id</a> the <a href="msualg_1.html#U1">OperSymbols</a> of <font color="Maroon">S2</font></span>)</span> &amp; <font color="Maroon">h</font> <a href="pboole.html#K7">*</a> <font color="Maroon">f</font> is    <a href="pboole.html#M3">ManySortedFunction</a> of the <a href="msualg_1.html#U4">Sorts</a> of <span class="p1">(<span class="default"><font color="Maroon">A1</font> <a href="instalg1.html#K1" target="_self">|</a> <font color="Maroon">S2</font>,<font color="Maroon">f</font>,<span class="p2">(<span class="default"><a href="partfun1.html#K6">id</a> the <a href="msualg_1.html#U1">OperSymbols</a> of <font color="Maroon">S2</font></span>)</span></span>)</span>,the <a href="msualg_1.html#U4">Sorts</a> of <span class="p1">(<span class="default"><font color="Maroon">A2</font> <a href="instalg1.html#K1" target="_self">|</a> <font color="Maroon">S2</font>,<font color="Maroon">f</font>,<span class="p2">(<span class="default"><a href="partfun1.html#K6">id</a> the <a href="msualg_1.html#U1">OperSymbols</a> of <font color="Maroon">S2</font></span>)</span></span>)</span> )
 
<b>by </b><i>, </i>;<br/>
<b>hence </b><a NAME="E4:40"/>
<font color="Maroon">h</font> <a href="relat_1.html#K7">|</a> the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">S2</font> is    <a href="pboole.html#M3">ManySortedFunction</a> of the <a href="msualg_1.html#U4">Sorts</a> of <span class="p1">(<span class="default"><font color="Maroon">A1</font> <a href="instalg1.html#K2" target="_self">|</a> <font color="Maroon">S2</font></span>)</span>,the <a href="msualg_1.html#U4">Sorts</a> of <span class="p1">(<span class="default"><font color="Maroon">A2</font> <a href="instalg1.html#K2" target="_self">|</a> <font color="Maroon">S2</font></span>)</span>
 <b>by </b><i><a class="ref" href="relat_1.html#T94">RELAT_1:94</a></i>;<br/>


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