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<b>let </b><font color="Maroon">X</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">m</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="coh_sp.html#K21" target="_self">MapsT</a> <font color="Maroon">X</font>;<br/><b>let </b><font color="Maroon">m1</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="coh_sp.html#K21" target="_self">MapsT</a> <font color="Maroon">X</font>;<br/>





<a NAME="E1:70"/>
( <font color="Maroon">m</font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="tarski.html#K4">[</a><span class="default"><span class="p2"><a href="tarski.html#K4">[</a><span class="default"><span class="p3">(<span class="default"><a href="coh_sp.html#K22" target="_self">dom</a> <font color="Maroon">m</font></span>)</span>,<span class="p3">(<span class="default"><a href="coh_sp.html#K23" target="_self">cod</a> <font color="Maroon">m</font></span>)</span></span><a href="tarski.html#K4">]</a></span>,<span class="p2">(<span class="default"><font color="Maroon">m</font> <a href="mcart_1.html#K2">`2</a> </span>)</span></span><a href="tarski.html#K4">]</a></span> &amp; <font color="Maroon">m1</font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="tarski.html#K4">[</a><span class="default"><span class="p2"><a href="tarski.html#K4">[</a><span class="default"><span class="p3">(<span class="default"><a href="coh_sp.html#K22" target="_self">dom</a> <font color="Maroon">m1</font></span>)</span>,<span class="p3">(<span class="default"><a href="coh_sp.html#K23" target="_self">cod</a> <font color="Maroon">m1</font></span>)</span></span><a href="tarski.html#K4">]</a></span>,<span class="p2">(<span class="default"><font color="Maroon">m1</font> <a href="mcart_1.html#K2">`2</a> </span>)</span></span><a href="tarski.html#K4">]</a></span> )
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:70"/>
( <font color="Maroon">m</font> <a href="mcart_1.html#K2">`2</a>  <a href="hidden.html#R1">=</a> <font color="Maroon">m1</font> <a href="mcart_1.html#K2">`2</a>  &amp;  <a href="coh_sp.html#K22" target="_self">dom</a> <font color="Maroon">m</font> <a href="hidden.html#R1">=</a>  <a href="coh_sp.html#K22" target="_self">dom</a> <font color="Maroon">m1</font> &amp;  <a href="coh_sp.html#K23" target="_self">cod</a> <font color="Maroon">m</font> <a href="hidden.html#R1">=</a>  <a href="coh_sp.html#K23" target="_self">cod</a> <font color="Maroon">m1</font> implies <font color="Maroon">m</font> <a href="hidden.html#R1">=</a> <font color="Maroon">m1</font> )
 ;<br/>


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