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<b>let </b><font color="Maroon">X</font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">f</font> be   <a href="partfun1.html#NM1">PartFunc</a> of <font color="Maroon">X</font>, <a href="supinf_1.html#K3">REAL</a> ;<br/>



<a NAME="E1:34"/><i><font color="Green">E37</font></i>: 
 <a href="mesfunc1.html#K9">-</a> <span class="p1">(<span class="default"><a href="mesfunc5.html#K1">R_EAL</a> <font color="Maroon">f</font></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="real_1.html#K1">-</a> 1</span>)</span> <a href="mesfunc1.html#K8">(#)</a> <span class="p1">(<span class="default"><a href="mesfunc5.html#K1">R_EAL</a> <font color="Maroon">f</font></span>)</span>
 
<b>by </b><i><a class="ref" href="mesfunc2.html#T11">MESFUNC2:11</a></i>;<br/>
<a NAME="E2:34"/>
<span class="p1">(<span class="default"><a href="real_1.html#K1">-</a> 1</span>)</span> <a href="mesfunc1.html#K8">(#)</a> <span class="p1">(<span class="default"><a href="mesfunc5.html#K1">R_EAL</a> <font color="Maroon">f</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="mesfunc5.html#K1">R_EAL</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="real_1.html#K1">-</a> 1</span>)</span> <a href="seq_1.html#K13">(#)</a> <font color="Maroon">f</font></span>)</span>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E3:34"/>
(  <a href="mesfunc1.html#K9">-</a> <span class="p1">(<span class="default"><a href="mesfunc5.html#K1">R_EAL</a> <font color="Maroon">f</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="mesfunc5.html#K1">R_EAL</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="real_1.html#K1">-</a> 1</span>)</span> <a href="seq_1.html#K13">(#)</a> <font color="Maroon">f</font></span>)</span> &amp;  <a href="mesfunc1.html#K9">-</a> <span class="p1">(<span class="default"><a href="mesfunc5.html#K1">R_EAL</a> <font color="Maroon">f</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="mesfunc5.html#K1">R_EAL</a> <span class="p1">(<span class="default"><a href="seq_1.html#K16">-</a> <font color="Maroon">f</font></span>)</span> )
 <b>by </b><i>, <a class="ref" href="rfunct_1.html#T38">RFUNCT_1:38</a></i>;<br/>


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