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<b>let </b><font color="Maroon">Y</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">X</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">T</font> be   <a href="eqrel_1.html#NM1">Tolerance</a> of <font color="Maroon">X</font>;<br/>





<b>assume </b><a NAME="E1:23"/>
<font color="Maroon">Y</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">X</font>
 ;<br/>

<b>then reconsider </b><font color="Maroon">Z</font> = <font color="Maroon">Y</font> as   <a href="subset_1.html#NM2">Subset</a> of <font color="Maroon">X</font> ;<br/>
<a NAME="E3:23"/>
<font color="Maroon">T</font> <a href="toler_1.html#K2" target="_self">|_2</a> <font color="Maroon">Z</font> is   <a href="eqrel_1.html#NM1">Tolerance</a> of <font color="Maroon">Z</font>
 
;<br/>
<b>hence </b><a NAME="E4:23"/>
<font color="Maroon">T</font> <a href="toler_1.html#K1" target="_self">|_2</a> <font color="Maroon">Y</font> is   <a href="eqrel_1.html#NM1">Tolerance</a> of <font color="Maroon">Y</font>
 ;<br/>


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