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<b>let </b><font color="Maroon">c<sub>1</sub></font> be  <a href="xreal_0.html#V1">real</a> <a href="rat_1.html#V1">irrational</a>  <a href="ordinal1.html#NM1" target="_self">number</a> ;<br/>

<a NAME="E1:47"/>
 <a href="int_1.html#K4">frac</a> <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>1</sub></font> <a href="xcmplx_0.html#K6">-</a> <span class="p1"><a href="int_1.html#K1">[\</a><span class="default"><font color="Maroon">c<sub>1</sub></font></span><a href="int_1.html#K1">/]</a></span>
 
<b>by </b><i><a class="ref" href="int_1.html#D6">INT_1:def 6</a></i>;<br/>
<b>hence </b><a NAME="E2:47"/>
 <a href="int_1.html#K4">frac</a> <font color="Maroon">c<sub>1</sub></font> is <a href="rat_1.html#V1">irrational</a>
 <b>by </b><i><a class="ref" href="borsuk_5.html#T41" target="_self">Th41</a></i>;<br/>


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