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<b>let </b><font color="Maroon" title="c1">X</font> be  non <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>  <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ;<br/><b>let </b><font color="Maroon" title="c2">f</font> be   <a href="funct_2.html#NM1" title="FUNCT_2:NM.1">Function</a> of <font color="Maroon" title="c1">X</font>, <a href="numbers.html#K1" title="NUMBERS:func.1">REAL</a> ;<br/>



<a NAME="E1:64"/>
 <a href="valued_1.html#K32" title="VALUED_1:func.32">-</a> <span class="p1">(<span class="default"><a href="valued_1.html#K32" title="VALUED_1:func.32">-</a> <font color="Maroon" title="c2">f</font></span>)</span> <a href="funct_2.html#R2" title="FUNCT_2:pred.2">=</a> <font color="Maroon" title="c2">f</font>
 
;<br/>
<b>hence </b><a NAME="E2:64"/>
( <font color="Maroon" title="c2">f</font> is <a href="pscomp_1.html#V7" title="PSCOMP_1:attr.7">with_max</a> iff  <a href="valued_1.html#K32" title="VALUED_1:func.32">-</a> <font color="Maroon" title="c2">f</font> is <a href="pscomp_1.html#V8" title="PSCOMP_1:attr.8">with_min</a> )
 <b>by </b><i><a class="ref" href="pscomp_1.html#T41" target="_self" title="PSCOMP_1:th.41">Th41</a></i>;<br/>


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