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<b>let </b><font color="Maroon">r1</font> be   <a href="real_1.html#NM1">Real</a>, <font color="Maroon">r2</font> be   <a href="real_1.html#NM1">Real</a>;<br/><b>let </b><font color="Maroon">fr1</font> be   <a href="struct_0.html#NM1">Element</a> of <a href="vectsp_1.html#K3">F_Real</a> , <font color="Maroon">fr2</font> be   <a href="struct_0.html#NM1">Element</a> of <a href="vectsp_1.html#K3">F_Real</a> ;<br/>



<b>assume </b><a NAME="E1:2"/>
( <font color="Maroon">r1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">fr1</font> &amp; <font color="Maroon">r2</font> <a href="hidden.html#R1">=</a> <font color="Maroon">fr2</font> )
 ;<br/>

<b>then </b><font color="Maroon">fr1</font> <a href="group_1.html#K10">*</a> <font color="Maroon">fr2</font> = 
<a href="binop_2.html#K35">multreal</a>  <a href="binop_1.html#K2">.</a> <font color="Maroon">r1</font>,<font color="Maroon">r2</font>
<b>by </b><i><a class="ref" href="group_1.html#D1">GROUP_1:def 1</a></i>
<br/>.= 
<font color="Maroon">r1</font> <a href="binop_2.html#K11">*</a> <font color="Maroon">r2</font>
<b>by </b><i><a class="ref" href="binop_2.html#D11">BINOP_2:def 11</a></i>
;<br/>
<b>hence </b><a NAME="E3:2"/>
<font color="Maroon">r1</font> <a href="binop_2.html#K11">*</a> <font color="Maroon">r2</font> <a href="hidden.html#R1">=</a> <font color="Maroon">fr1</font> <a href="group_1.html#K10">*</a> <font color="Maroon">fr2</font>
 ;<br/>


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