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<a NAME="E1:22_1_1"/><i><font color="Green">E17</font></i>: 
( (  <a href="ens_1.html#K4" target="_self">cod</a> <font color="Maroon">m1</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="xboole_0.html#K1">{}</a>  or  <a href="ens_1.html#K3" target="_self">dom</a> <font color="Maroon">m1</font> <a href="hidden.html#R1">=</a>  <a href="xboole_0.html#K1">{}</a>  ) &amp; <font color="Maroon">m1</font> <a href="mcart_1.html#K2">`2</a>  is   <a href="funct_2.html#NM1">Function</a> of  <a href="ens_1.html#K3" target="_self">dom</a> <font color="Maroon">m1</font>, <a href="ens_1.html#K4" target="_self">cod</a> <font color="Maroon">m1</font> &amp; (  <a href="ens_1.html#K4" target="_self">cod</a> <font color="Maroon">m2</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="xboole_0.html#K1">{}</a>  or  <a href="ens_1.html#K3" target="_self">dom</a> <font color="Maroon">m2</font> <a href="hidden.html#R1">=</a>  <a href="xboole_0.html#K1">{}</a>  ) &amp; <font color="Maroon">m2</font> <a href="mcart_1.html#K2">`2</a>  is   <a href="funct_2.html#NM1">Function</a> of  <a href="ens_1.html#K3" target="_self">dom</a> <font color="Maroon">m2</font>, <a href="ens_1.html#K4" target="_self">cod</a> <font color="Maroon">m2</font> )
 
<b>by </b><i/>;<br/>
<a NAME="E2:22_1_1"/><b>then </b>
<span class="p1">(<span class="default"><font color="Maroon">m2</font> <a href="mcart_1.html#K2">`2</a> </span>)</span> <a href="funct_1.html#NK3" target="_self">*</a> <span class="p1">(<span class="default"><font color="Maroon">m1</font> <a href="mcart_1.html#K2">`2</a> </span>)</span> is   <a href="funct_2.html#NM1">Function</a> of  <a href="ens_1.html#K3" target="_self">dom</a> <font color="Maroon">m1</font>, <a href="ens_1.html#K4" target="_self">cod</a> <font color="Maroon">m2</font>
 
<b>by </b><i>, <a class="ref" href="funct_2.html#T19">FUNCT_2:19</a></i>;<br/>
<b>hence </b><a NAME="E3:22_1_1"/>
<span class="p1"><a href="tarski.html#K4">[</a><span class="default"><span class="p2"><a href="domain_1.html#K1">[</a><span class="default"><span class="p3">(<span class="default"><a href="ens_1.html#K3" target="_self">dom</a> <font color="Maroon">m1</font></span>)</span>,<span class="p3">(<span class="default"><a href="ens_1.html#K4" target="_self">cod</a> <font color="Maroon">m2</font></span>)</span></span><a href="domain_1.html#K1">]</a></span>,<span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">m2</font> <a href="mcart_1.html#K2">`2</a> </span>)</span> <a href="funct_1.html#NK3" target="_self">*</a> <span class="p3">(<span class="default"><font color="Maroon">m1</font> <a href="mcart_1.html#K2">`2</a> </span>)</span></span>)</span></span><a href="tarski.html#K4">]</a></span> is    <a href="subset_1.html#M1">Element</a> of  <a href="ens_1.html#K2" target="_self">Maps</a> <font color="Maroon">V</font>
 <b>by </b><i>, , </i>;<br/>


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