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<b>let </b><font color="Maroon">f</font> be   <a href="funct_1.html#NM1">Function</a>;<br/>

<b>assume </b><a NAME="E1:3_1_1"/><i><font color="Green">E34</font></i>: 
<font color="Maroon">f</font> is <a href="realset1.html#V1">trivial</a>
 ;<br/>

<b>assume </b><a NAME="E2:3_1_1"/>
not <font color="Maroon">f</font> is <a href="funct_1.html#V3">constant</a>
 ;<br/>

<b>then reconsider </b><font color="Maroon">f</font> = <font color="Maroon">f</font> as  non <a href="funct_1.html#V3">constant</a> <a href="funct_1.html#NM1">Function</a> ;<br/>
<a NAME="E4:3_1_1"/>
not <font color="Maroon">f</font> is <a href="realset1.html#V1">trivial</a>
 
;<br/>
<b>hence </b><a NAME="E5:3_1_1"/>
contradiction
 <b>by </b><i/>;<br/>


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