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

<b>set </b><font color="Maroon">ab</font> = <span class="p1">(<span class="default"><a href="xxreal_0.html#K4">max</a> <font color="Maroon">a</font>,<font color="Maroon">b</font></span>)</span> <a href="xcmplx_0.html#K2">+</a> 1;<br/>
<a NAME="E1:110"/><i><font color="Green">E34</font></i>: 
<span class="p1">(<span class="default"><a href="xxreal_0.html#K4">max</a> <font color="Maroon">a</font>,<font color="Maroon">b</font></span>)</span> <a href="xcmplx_0.html#K2">+</a> 1 <a href="hidden.html#R2">in</a>  <a href="numbers.html#K1">REAL</a> 
 
<b>by </b><i><a class="ref" href="xreal_0.html#D1">XREAL_0:def 1</a></i>;<br/>
<a NAME="E2:110"/><i><font color="Green">E35</font></i>: 
(  <a href="xxreal_0.html#K4">max</a> <font color="Maroon">a</font>,<font color="Maroon">b</font> <a href="xxreal_0.html#NR2" target="_self">&gt;=</a> <font color="Maroon">a</font> &amp;  <a href="xxreal_0.html#K4">max</a> <font color="Maroon">a</font>,<font color="Maroon">b</font> <a href="xxreal_0.html#NR2" target="_self">&gt;=</a> <font color="Maroon">b</font> )
 
<b>by </b><i><a class="ref" href="xxreal_0.html#T25">XXREAL_0:25</a></i>;<br/>
<a NAME="E3:110"/><i><font color="Green">E48</font></i>: 
<span class="p1">(<span class="default"><a href="xxreal_0.html#K4">max</a> <font color="Maroon">a</font>,<font color="Maroon">b</font></span>)</span> <a href="xcmplx_0.html#K2">+</a> 1 <a href="xxreal_0.html#NR4" target="_self">&gt;</a>  <a href="xxreal_0.html#K4">max</a> <font color="Maroon">a</font>,<font color="Maroon">b</font>
 
<b>by </b><i><a class="ref" href="xreal_1.html#T31">XREAL_1:31</a></i>;<br/>
<a NAME="E4:110"/><b>then </b>
( <span class="p1">(<span class="default"><a href="xxreal_0.html#K4">max</a> <font color="Maroon">a</font>,<font color="Maroon">b</font></span>)</span> <a href="xcmplx_0.html#K2">+</a> 1 <a href="xxreal_0.html#NR4" target="_self">&gt;</a> <font color="Maroon">a</font> &amp; <span class="p1">(<span class="default"><a href="xxreal_0.html#K4">max</a> <font color="Maroon">a</font>,<font color="Maroon">b</font></span>)</span> <a href="xcmplx_0.html#K2">+</a> 1 <a href="xxreal_0.html#NR4" target="_self">&gt;</a> <font color="Maroon">b</font> )
 
<b>by </b><i>, <a class="ref" href="xxreal_0.html#T2">XXREAL_0:2</a></i>;<br/>
<a NAME="E5:110"/><b>then </b><i><font color="Green">E49</font></i>: 
not <span class="p1">(<span class="default"><a href="xxreal_0.html#K4">max</a> <font color="Maroon">a</font>,<font color="Maroon">b</font></span>)</span> <a href="xcmplx_0.html#K2">+</a> 1 <a href="hidden.html#R2">in</a> <span class="p1"><a href="borsuk_5.html#NK1" target="_self">].-infty,</a><span class="default"><font color="Maroon">a</font></span><a href="borsuk_5.html#NK1" target="_self">.]</a></span>
 
<b>by </b><i/>;<br/>
<a NAME="E6:110"/>
not <span class="p1">(<span class="default"><a href="xxreal_0.html#K4">max</a> <font color="Maroon">a</font>,<font color="Maroon">b</font></span>)</span> <a href="xcmplx_0.html#K2">+</a> 1 <a href="hidden.html#R2">in</a> <span class="p1"><a href="seq_4.html#K1">{</a><span class="default"><font color="Maroon">b</font></span><a href="seq_4.html#K1">}</a></span>
 
<b>by </b><i>, , <a class="ref" href="tarski.html#D1">TARSKI:def 1</a></i>;<br/>
<b>hence </b><a NAME="E7:110"/>
<span class="p1"><a href="borsuk_5.html#NK1" target="_self">].-infty,</a><span class="default"><font color="Maroon">a</font></span><a href="borsuk_5.html#NK1" target="_self">.]</a></span> <a href="subset_1.html#K4">\/</a> <span class="p1"><a href="seq_4.html#K1">{</a><span class="default"><font color="Maroon">b</font></span><a href="seq_4.html#K1">}</a></span> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="numbers.html#K1">REAL</a> 
 <b>by </b><i><a class="ref" href="borsuk_5.html#T35" target="_self">Th35</a>, <a class="ref" href="borsuk_5.html#T36" target="_self">Th36</a>, <a class="ref" href="xboole_0.html#D2">XBOOLE_0:def 2</a></i>;<br/>


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