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<b>set </b><font color="Maroon" title="c2">F</font> =  <a href="seq_1.html#K15" title="SEQ_1:func.15">-</a> <font color="Maroon" title="c1">f</font>;<br/>
<b>let </b><font color="Maroon" title="c3">y</font> be    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="tarski.html#D3" title="TARSKI:def.3">TARSKI:def 3</a>,<a class="ref" href="seq_1.html#D1" target="_self" title="SEQ_1:def.1">SEQ_1:def 1</a><br/>

<b>assume </b><a NAME="E1:33_1_1"/>
<font color="Maroon" title="c3">y</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="relat_1.html#K2" title="RELAT_1:func.2">rng</a> <span class="p1">(<span class="default"><a href="seq_1.html#K15" title="SEQ_1:func.15">-</a> <font color="Maroon" title="c1">f</font></span>)</span>
 ;<br/>

<b>then consider </b><font color="Maroon" title="c4">x</font> being    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> <b> such that </b><br/><a NAME="E3:33_1_1"/><i><font color="Green" title="E15">A1</font></i>: 
<font color="Maroon" title="c4">x</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="relat_1.html#K1" title="RELAT_1:func.1">dom</a> <span class="p1">(<span class="default"><a href="seq_1.html#K15" title="SEQ_1:func.15">-</a> <font color="Maroon" title="c1">f</font></span>)</span>
 <b>and </b><br/><a NAME="E4:33_1_1"/><i><font color="Green" title="E16">A2</font></i>: 
<span class="p1">(<span class="default"><a href="seq_1.html#K15" title="SEQ_1:func.15">-</a> <font color="Maroon" title="c1">f</font></span>)</span> <a href="funct_1.html#K1" title="FUNCT_1:func.1">.</a> <font color="Maroon" title="c4">x</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c3">y</font>
 <b>by </b><i><a class="ref" href="funct_1.html#D5" title="FUNCT_1:def.5">FUNCT_1:def 5</a></i>;<br/>
<a NAME="E5:33_1_1"/>
<span class="p1">(<span class="default"><a href="seq_1.html#K15" title="SEQ_1:func.15">-</a> <font color="Maroon" title="c1">f</font></span>)</span> <a href="funct_1.html#K1" title="FUNCT_1:func.1">.</a> <font color="Maroon" title="c4">x</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="real_1.html#K1" title="REAL_1:func.1">-</a> <span class="p1">(<span class="default"><font color="Maroon" title="c1">f</font> <a href="seq_1.html#K1" title="SEQ_1:func.1">.</a> <font color="Maroon" title="c4">x</font></span>)</span>
 
<b>by </b><i><a class="txt" href="seq_1.html#E3:33_1_1"><i><font color="Green" title="E15">A1</font></i></a>, <a class="ref" href="seq_1.html#D7" target="_self" title="SEQ_1:def.7">Def7</a></i>;<br/>
<b>hence </b><a NAME="E6:33_1_1"/>
<font color="Maroon" title="c3">y</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="numbers.html#K1" title="NUMBERS:func.1">REAL</a> 
 <b>by </b><i><a class="txt" href="seq_1.html#E4:33_1_1"><i><font color="Green" title="E16">A2</font></i></a></i>;<br/>


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