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<b>let </b><font color="Maroon">b</font> be   <a href="binop_1.html#NM1">UnOp</a> of  <a href="numbers.html#K4">INT</a> ;<br/>

<div><b>hereby </b>
<div class="add"><b>assume </b><a NAME="E1:2_1_1_1"/><i><font color="Green">E19</font></i>: 
<font color="Maroon">b</font> <a href="funct_2.html#R2">=</a>  <a href="binop_2.html#K43">compint</a> 
 ;<br/><b>let </b><font color="Maroon">i</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K4">INT</a> ;<br/><a NAME="E2:2_1_1_1"/>
<font color="Maroon">i</font> <a href="hidden.html#R2">in</a>  <a href="numbers.html#K4">INT</a> 
 ;<br/><a NAME="E3:2_1_1_1"/><b>then </b><i><font color="Green">E22</font></i>: 
<font color="Maroon">i</font> <a href="hidden.html#R2">in</a>  <a href="numbers.html#K1">REAL</a> 
 <b>by </b><i><a class="ref" href="numbers.html#T15">NUMBERS:15</a></i>;<br/><b>thus </b><font color="Maroon">b</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">i</font> = 
 <a href="binop_2.html#K19">-</a> <font color="Maroon">i</font>
<b>by </b><i>, <a class="ref" href="binop_2.html#D19">BINOP_2:def 19</a></i>
<br/>.= 
<a href="binop_2.html#K31">compreal</a>  <a href="funct_1.html#K1">.</a> <font color="Maroon">i</font>
<b>by </b><i>, <a class="ref" href="binop_2.html#D7">BINOP_2:def 7</a></i>
;<br/></div>
<b>end;</b></div>

<b>assume </b><a NAME="E2:2_1_1"/><i><font color="Green">E23</font></i>: 
for <font color="Olive">i</font> being   <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K4">INT</a>  holds  <font color="Maroon">b</font> <a href="funct_2.html#K3">.</a> <font color="Olive">i</font> <a href="hidden.html#R1">=</a> <a href="binop_2.html#K31">compreal</a>  <a href="funct_1.html#K1">.</a> <font color="Olive">i</font>
 ;<br/>

<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="2_1_1_2"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">i</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K4">INT</a> ;<br/><a NAME="E1:2_1_1_2"/>
<font color="Maroon">i</font> <a href="hidden.html#R2">in</a>  <a href="numbers.html#K4">INT</a> 
 ;<br/><a NAME="E2:2_1_1_2"/><b>then </b><i><font color="Green">E24</font></i>: 
<font color="Maroon">i</font> <a href="hidden.html#R2">in</a>  <a href="numbers.html#K1">REAL</a> 
 <b>by </b><i><a class="ref" href="numbers.html#T15">NUMBERS:15</a></i>;<br/><b>thus </b><font color="Maroon">b</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">i</font> = 
<a href="binop_2.html#K31">compreal</a>  <a href="funct_1.html#K1">.</a> <font color="Maroon">i</font>
<b>by </b><i/>
<br/>.= 
 <a href="binop_2.html#K19">-</a> <font color="Maroon">i</font>
<b>by </b><i>, <a class="ref" href="binop_2.html#D7">BINOP_2:def 7</a></i>
<br/>.= 
<a href="binop_2.html#K43">compint</a>  <a href="funct_2.html#K3">.</a> <font color="Maroon">i</font>
<b>by </b><i><a class="ref" href="binop_2.html#D19">BINOP_2:def 19</a></i>
;<br/></div><b>end;</b></div>
<b>hence </b><a NAME="E4:2_1_1"/>
<font color="Maroon">b</font> <a href="funct_2.html#R2">=</a>  <a href="binop_2.html#K43">compint</a> 
 <b>by </b><i><a class="ref" href="funct_2.html#T113">FUNCT_2:113</a></i>;<br/>


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