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<b>let </b><font color="Maroon">c<sub>1</sub></font> be   <a href="osalg_1.html#NM3">OrderSortedSign</a>;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font>, <font color="Maroon">c<sub>3</sub></font> be   <a href="osalg_1.html#NM2">OperSymbol</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>





<b>assume </b><a NAME="E1:70"/><i><font color="Green">E40</font></i>: 
( <font color="Maroon">c<sub>2</sub></font> <a href="osalg_1.html#R6" target="_self">&lt;=</a> <font color="Maroon">c<sub>3</sub></font> &amp; <font color="Maroon">c<sub>3</sub></font> <a href="osalg_1.html#R6" target="_self">&lt;=</a> <font color="Maroon">c<sub>2</sub></font> )
 ;<br/>

<a NAME="E2:70"/><b>then </b><i><font color="Green">E41</font></i>: 
( <font color="Maroon">c<sub>2</sub></font> <a href="osalg_1.html#R1" target="_self">~=</a> <font color="Maroon">c<sub>3</sub></font> &amp;  <a href="msualg_1.html#K1">the_arity_of</a> <font color="Maroon">c<sub>2</sub></font> <a href="osalg_1.html#R2" target="_self">&lt;=</a>  <a href="msualg_1.html#K1">the_arity_of</a> <font color="Maroon">c<sub>3</sub></font> &amp;  <a href="osalg_1.html#K1" target="_self">the_result_sort_of</a> <font color="Maroon">c<sub>2</sub></font> <a href="orders_2.html#R3">&lt;=</a>  <a href="osalg_1.html#K1" target="_self">the_result_sort_of</a> <font color="Maroon">c<sub>3</sub></font> )
 
<b>by </b><i><a class="ref" href="osalg_1.html#D22" target="_self">Def22</a></i>;<br/>
<a NAME="E3:70"/>
( <font color="Maroon">c<sub>3</sub></font> <a href="osalg_1.html#R1" target="_self">~=</a> <font color="Maroon">c<sub>2</sub></font> &amp;  <a href="msualg_1.html#K1">the_arity_of</a> <font color="Maroon">c<sub>3</sub></font> <a href="osalg_1.html#R2" target="_self">&lt;=</a>  <a href="msualg_1.html#K1">the_arity_of</a> <font color="Maroon">c<sub>2</sub></font> &amp;  <a href="osalg_1.html#K1" target="_self">the_result_sort_of</a> <font color="Maroon">c<sub>3</sub></font> <a href="orders_2.html#R3">&lt;=</a>  <a href="osalg_1.html#K1" target="_self">the_result_sort_of</a> <font color="Maroon">c<sub>2</sub></font> )
 
<b>by </b><i><a class="txt" href="osalg_1.html#E1:70"><i><font color="Green">E40</font></i></a>, <a class="ref" href="osalg_1.html#D22" target="_self">Def22</a></i>;<br/>
<a NAME="E4:70"/><b>then </b>
(  <a href="msualg_1.html#K1">the_arity_of</a> <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a>  <a href="msualg_1.html#K1">the_arity_of</a> <font color="Maroon">c<sub>3</sub></font> &amp;  <a href="osalg_1.html#K1" target="_self">the_result_sort_of</a> <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a>  <a href="osalg_1.html#K1" target="_self">the_result_sort_of</a> <font color="Maroon">c<sub>3</sub></font> )
 
<b>by </b><i><a class="txt" href="osalg_1.html#E2:70"><i><font color="Green">E41</font></i></a>, <a class="ref" href="osalg_1.html#T6" target="_self">Th6</a>, <a class="ref" href="orders_2.html#T25">ORDERS_2:25</a></i>;<br/>
<b>hence </b><a NAME="E5:70"/>
<font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>3</sub></font>
 <b>by </b><i><a class="txt" href="osalg_1.html#E2:70"><i><font color="Green">E41</font></i></a>, <a class="ref" href="osalg_1.html#D4" target="_self">Def4</a></i>;<br/>


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