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<b>take </b>
<font color="Maroon">c<sub>1</sub></font>
;<br/>

<b>thus </b><a NAME="E1:15_1_1"/>
( <font color="Maroon">c<sub>2</sub></font> <a href="tarski.html#R1">c=</a>  <a href="setfam_1.html#K5">union</a> <span class="p1">(<span class="default"><a href="relset_1.html#K5">rng</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> &amp; ( for <font color="Olive">b<sub>1</sub></font> being  <a href="nat_1.html#NM1">Nat</a> holds <font color="Maroon">c<sub>1</sub></font> <a href="prob_1.html#K1">.</a> <font color="Olive">b<sub>1</sub></font> is   <a href="measure5.html#NM1">Interval</a> ) )
 <b>by </b><i><a class="txt" href="measure7.html#E18"><i><font color="Green">Lemma15</font></i></a>, <a class="txt" href="measure7.html#E19"><i><font color="Green">Lemma16</font></i></a>, <a class="ref" href="xboole_1.html#T1">XBOOLE_1:1</a></i>;<br/>


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