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<b>let </b><font color="Maroon">f</font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="fraenkel.html#D1">FRAENKEL:def 1</a><br/>

<b>assume </b><a NAME="E1:32_1_1"/>
<font color="Maroon">f</font> <a href="hidden.html#R2">in</a>  <a href="amistd_2.html#K5" target="_self">AddressParts</a> <font color="Maroon">T</font>
 ;<br/>

<a NAME="E2:32_1_1"/><b>then </b>
 ex <font color="Olive">I</font> being  <a href="ami_1.html#NM3">Instruction</a> of <font color="Maroon">S</font> st <br/>( <font color="Maroon">f</font> <a href="hidden.html#R1">=</a>  <a href="amistd_2.html#K4" target="_self">AddressPart</a> <font color="Olive">I</font> &amp;  <a href="ami_5.html#K1">InsCode</a> <font color="Olive">I</font> <a href="hidden.html#R1">=</a> <font color="Maroon">T</font> )
 
;<br/>
<b>hence </b><a NAME="E3:32_1_1"/>
<font color="Maroon">f</font> is   <a href="funct_1.html#NM1">Function</a>
 ;<br/>


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