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<b>let </b><font color="Maroon" title="c1">A</font>, <font color="Maroon" title="c2">B</font>, <font color="Maroon" title="c3">C</font> be  <a href="membered.html#V1" title="MEMBERED:attr.1">complex-membered</a>  <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ; <a class="txt" onclick="hs(this)" href="javascript:()"><i><font color="Red">::  thesis: </font></i></a><span class="hide"> <font color="Maroon" title="c1">A</font> <a href="member_1.html#K10" title="MEMBER_1:func.10">**</a> <span class="p1">(<span class="default"><font color="Maroon" title="c2">B</font> <a href="member_1.html#K6" title="MEMBER_1:func.6">++</a> <font color="Maroon" title="c3">C</font></span>)</span> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a> <span class="p1">(<span class="default"><font color="Maroon" title="c1">A</font> <a href="member_1.html#K10" title="MEMBER_1:func.10">**</a> <font color="Maroon" title="c2">B</font></span>)</span> <a href="member_1.html#K6" title="MEMBER_1:func.6">++</a> <span class="p1">(<span class="default"><font color="Maroon" title="c1">A</font> <a href="member_1.html#K10" title="MEMBER_1:func.10">**</a> <font color="Maroon" title="c3">C</font></span>)</span></span><br/><b>let </b><font color="Maroon" title="c4">a</font> be  <a href="xcmplx_0.html#V1" title="XCMPLX_0:attr.1">complex</a>  <a href="ordinal1.html#NM1" title="ORDINAL1:NM.1">number</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="membered.html#D7" title="MEMBERED:def.7">MEMBERED:def 7</a> <a class="txt" onclick="hs(this)" href="javascript:()"><i><font color="Red">::  thesis: </font></i></a><span class="hide"> (  not <font color="Maroon" title="c4">a</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c1">A</font> <a href="member_1.html#K10" title="MEMBER_1:func.10">**</a> <span class="p1">(<span class="default"><font color="Maroon" title="c2">B</font> <a href="member_1.html#K6" title="MEMBER_1:func.6">++</a> <font color="Maroon" title="c3">C</font></span>)</span> or <font color="Maroon" title="c4">a</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <span class="p1">(<span class="default"><font color="Maroon" title="c1">A</font> <a href="member_1.html#K10" title="MEMBER_1:func.10">**</a> <font color="Maroon" title="c2">B</font></span>)</span> <a href="member_1.html#K6" title="MEMBER_1:func.6">++</a> <span class="p1">(<span class="default"><font color="Maroon" title="c1">A</font> <a href="member_1.html#K10" title="MEMBER_1:func.10">**</a> <font color="Maroon" title="c3">C</font></span>)</span> )</span><br/>







<b>assume </b><a NAME="E1:165"/>
<font color="Maroon" title="c4">a</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c1">A</font> <a href="member_1.html#K10" title="MEMBER_1:func.10">**</a> <span class="p1">(<span class="default"><font color="Maroon" title="c2">B</font> <a href="member_1.html#K6" title="MEMBER_1:func.6">++</a> <font color="Maroon" title="c3">C</font></span>)</span>
 ; <a class="txt" onclick="hs(this)" href="javascript:()"><i><font color="Red">::  thesis: </font></i></a><span class="hide"> <font color="Maroon" title="c4">a</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <span class="p1">(<span class="default"><font color="Maroon" title="c1">A</font> <a href="member_1.html#K10" title="MEMBER_1:func.10">**</a> <font color="Maroon" title="c2">B</font></span>)</span> <a href="member_1.html#K6" title="MEMBER_1:func.6">++</a> <span class="p1">(<span class="default"><font color="Maroon" title="c1">A</font> <a href="member_1.html#K10" title="MEMBER_1:func.10">**</a> <font color="Maroon" title="c3">C</font></span>)</span></span><br/>

<b>then consider </b><font color="Maroon" title="c5">c</font>, <font color="Maroon" title="c6">c1</font> being    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="numbers.html#K2" title="NUMBERS:func.2">COMPLEX</a> <b> such that </b><br/><a NAME="E3:165"/><i><font color="Green" title="E83">A1</font></i>: 
<font color="Maroon" title="c4">a</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c5">c</font> <a href="binop_2.html#K5" title="BINOP_2:func.5">*</a> <font color="Maroon" title="c6">c1</font>
 <b>and </b><br/><a NAME="E4:165"/><i><font color="Green" title="E84">A2</font></i>: 
<font color="Maroon" title="c5">c</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c1">A</font>
 <b>and </b><br/><a NAME="E5:165"/><i><font color="Green" title="E85">A3</font></i>: 
<font color="Maroon" title="c6">c1</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c2">B</font> <a href="member_1.html#K6" title="MEMBER_1:func.6">++</a> <font color="Maroon" title="c3">C</font>
 ;<br/>
<b>consider </b><font color="Maroon" title="c7">c2</font>, <font color="Maroon" title="c8">c3</font> being    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="numbers.html#K2" title="NUMBERS:func.2">COMPLEX</a> <b> such that </b><br/><a NAME="E7:165"/><i><font color="Green" title="E86">A4</font></i>: 
<font color="Maroon" title="c6">c1</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c7">c2</font> <a href="binop_2.html#K3" title="BINOP_2:func.3">+</a> <font color="Maroon" title="c8">c3</font>
 <b>and </b><br/><a NAME="E8:165"/><i><font color="Green" title="E87">A5</font></i>: 
<font color="Maroon" title="c7">c2</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c2">B</font>
 <b>and </b><br/><a NAME="E9:165"/><i><font color="Green" title="E88">A6</font></i>: 
<font color="Maroon" title="c8">c3</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c3">C</font>
 <b>by </b><i><a class="txt" href="#E5:165"><i><font color="Green" title="E85">A3</font></i></a></i>;<br/>
<a NAME="E10:165"/><i><font color="Green" title="E89">A7</font></i>: 
<font color="Maroon" title="c4">a</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1">(<span class="default"><font color="Maroon" title="c5">c</font> <a href="binop_2.html#K5" title="BINOP_2:func.5">*</a> <font color="Maroon" title="c7">c2</font></span>)</span> <a href="binop_2.html#K3" title="BINOP_2:func.3">+</a> <span class="p1">(<span class="default"><font color="Maroon" title="c5">c</font> <a href="binop_2.html#K5" title="BINOP_2:func.5">*</a> <font color="Maroon" title="c8">c3</font></span>)</span>
 
<b>by </b><i><a class="txt" href="#E3:165"><i><font color="Green" title="E83">A1</font></i></a>, <a class="txt" href="#E7:165"><i><font color="Green" title="E86">A4</font></i></a></i>;<br/>
<a NAME="E11:165"/>
( <font color="Maroon" title="c5">c</font> <a href="binop_2.html#K5" title="BINOP_2:func.5">*</a> <font color="Maroon" title="c7">c2</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c1">A</font> <a href="member_1.html#K10" title="MEMBER_1:func.10">**</a> <font color="Maroon" title="c2">B</font> &amp; <font color="Maroon" title="c5">c</font> <a href="binop_2.html#K5" title="BINOP_2:func.5">*</a> <font color="Maroon" title="c8">c3</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c1">A</font> <a href="member_1.html#K10" title="MEMBER_1:func.10">**</a> <font color="Maroon" title="c3">C</font> )
 
<b>by </b><i><a class="txt" href="#E4:165"><i><font color="Green" title="E84">A2</font></i></a>, <a class="txt" href="#E8:165"><i><font color="Green" title="E87">A5</font></i></a>, <a class="txt" href="#E9:165"><i><font color="Green" title="E88">A6</font></i></a></i>;<br/>
<b>hence </b><a NAME="E12:165"/>
<font color="Maroon" title="c4">a</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <span class="p1">(<span class="default"><font color="Maroon" title="c1">A</font> <a href="member_1.html#K10" title="MEMBER_1:func.10">**</a> <font color="Maroon" title="c2">B</font></span>)</span> <a href="member_1.html#K6" title="MEMBER_1:func.6">++</a> <span class="p1">(<span class="default"><font color="Maroon" title="c1">A</font> <a href="member_1.html#K10" title="MEMBER_1:func.10">**</a> <font color="Maroon" title="c3">C</font></span>)</span>
 <b>by </b><i><a class="txt" href="#E10:165"><i><font color="Green" title="E89">A7</font></i></a></i>; <a class="txt" onclick="hs(this)" href="javascript:()"><i><font color="Red">::  thesis: </font></i></a><span class="hide"> verum</span><br/>


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