<?xml version="1.0"?>
<div class="add">

<b>let </b><font color="Maroon">c<sub>1</sub></font> be  <a href="integra1.html#V1">closed-interval</a> <a href="subset_1.html#NM2">Subset</a> of <a href="numbers.html#K1">REAL</a> ;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font> be   <a href="funct_2.html#NM1">Function</a> of <font color="Maroon">c<sub>1</sub></font>, <a href="numbers.html#K1">REAL</a> ;<br/>



<b>assume </b><b>that </b><br/><a NAME="E1:29"/><i><font color="Green">E28</font></i>: 
<font color="Maroon">c<sub>2</sub></font> <a href="rfunct_1.html#R3">is_bounded_on</a> <font color="Maroon">c<sub>1</sub></font>
 <b>and </b><br/><a NAME="E2:29"/><i><font color="Green">E29</font></i>: 
<font color="Maroon">c<sub>2</sub></font> <a href="integra1.html#R3">is_integrable_on</a> <font color="Maroon">c<sub>1</sub></font>
 ;<br/>

<a NAME="E3:29"/>
(  <a href="rfunct_3.html#K19">max+</a> <font color="Maroon">c<sub>2</sub></font> is <a href="partfun1.html#V1">total</a> &amp;  <a href="rfunct_3.html#K20">max-</a> <font color="Maroon">c<sub>2</sub></font> is <a href="partfun1.html#V1">total</a> )
 
<b>by </b><i><a class="ref" href="integra4.html#T13" target="_self">Th13</a></i>;<br/>
<a NAME="E4:29"/><b>then </b><i><font color="Green">E30</font></i>: 
(  <a href="rfunct_3.html#K19">max+</a> <font color="Maroon">c<sub>2</sub></font> is   <a href="funct_2.html#NM1">Function</a> of <font color="Maroon">c<sub>1</sub></font>, <a href="numbers.html#K1">REAL</a>  &amp;  <a href="rfunct_3.html#K20">max-</a> <font color="Maroon">c<sub>2</sub></font> is   <a href="funct_2.html#NM1">Function</a> of <font color="Maroon">c<sub>1</sub></font>, <a href="numbers.html#K1">REAL</a>  )
 
<b>by </b><i><a class="ref" href="funct_2.html#T131">FUNCT_2:131</a></i>;<br/>
<a NAME="E5:29"/>
( <font color="Maroon">c<sub>2</sub></font> <a href="rfunct_1.html#R1">is_bounded_above_on</a> <font color="Maroon">c<sub>1</sub></font> &amp; <font color="Maroon">c<sub>2</sub></font> <a href="rfunct_1.html#R2">is_bounded_below_on</a> <font color="Maroon">c<sub>1</sub></font> )
 
<b>by </b><i><a class="txt" href="integra4.html#E1:29"><i><font color="Green">E28</font></i></a>, <a class="ref" href="rfunct_1.html#D11">RFUNCT_1:def 11</a></i>;<br/>
<a NAME="E6:29"/><b>then </b>
(  <a href="rfunct_3.html#K19">max+</a> <font color="Maroon">c<sub>2</sub></font> <a href="rfunct_1.html#R1">is_bounded_above_on</a> <font color="Maroon">c<sub>1</sub></font> &amp;  <a href="rfunct_3.html#K19">max+</a> <font color="Maroon">c<sub>2</sub></font> <a href="rfunct_1.html#R2">is_bounded_below_on</a> <font color="Maroon">c<sub>1</sub></font> &amp;  <a href="rfunct_3.html#K20">max-</a> <font color="Maroon">c<sub>2</sub></font> <a href="rfunct_1.html#R1">is_bounded_above_on</a> <font color="Maroon">c<sub>1</sub></font> &amp;  <a href="rfunct_3.html#K20">max-</a> <font color="Maroon">c<sub>2</sub></font> <a href="rfunct_1.html#R2">is_bounded_below_on</a> <font color="Maroon">c<sub>1</sub></font> )
 
<b>by </b><i><a class="ref" href="integra4.html#T14" target="_self">Th14</a>, <a class="ref" href="integra4.html#T15" target="_self">Th15</a>, <a class="ref" href="integra4.html#T16" target="_self">Th16</a>, <a class="ref" href="integra4.html#T17" target="_self">Th17</a></i>;<br/>
<a NAME="E7:29"/><b>then </b><i><font color="Green">E31</font></i>: 
(  <a href="rfunct_3.html#K19">max+</a> <font color="Maroon">c<sub>2</sub></font> <a href="rfunct_1.html#R3">is_bounded_on</a> <font color="Maroon">c<sub>1</sub></font> &amp;  <a href="rfunct_3.html#K20">max-</a> <font color="Maroon">c<sub>2</sub></font> <a href="rfunct_1.html#R3">is_bounded_on</a> <font color="Maroon">c<sub>1</sub></font> )
 
<b>by </b><i><a class="ref" href="rfunct_1.html#D11">RFUNCT_1:def 11</a></i>;<br/>
<a NAME="E8:29"/><i><font color="Green">E32</font></i>: 
(  <a href="rfunct_3.html#K19">max+</a> <font color="Maroon">c<sub>2</sub></font> <a href="integra1.html#R3">is_integrable_on</a> <font color="Maroon">c<sub>1</sub></font> &amp;  <a href="rfunct_3.html#K20">max-</a> <font color="Maroon">c<sub>2</sub></font> <a href="integra1.html#R3">is_integrable_on</a> <font color="Maroon">c<sub>1</sub></font> )
 
<b>by </b><i><a class="txt" href="integra4.html#E1:29"><i><font color="Green">E28</font></i></a>, <a class="txt" href="integra4.html#E2:29"><i><font color="Green">E29</font></i></a>, <a class="ref" href="integra4.html#T20" target="_self">Th20</a>, <a class="ref" href="integra4.html#T22" target="_self">Th22</a></i>;<br/>
<a NAME="E9:29"/><b>then </b>
<span class="p1">(<span class="default"><a href="rfunct_3.html#K19">max+</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="seq_1.html#K6">+</a> <span class="p1">(<span class="default"><a href="rfunct_3.html#K20">max-</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="integra1.html#R3">is_integrable_on</a> <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="txt" href="integra4.html#E4:29"><i><font color="Green">E30</font></i></a>, <a class="txt" href="integra4.html#E7:29"><i><font color="Green">E31</font></i></a>, <a class="ref" href="integra1.html#T59">INTEGRA1:59</a></i>;<br/>
<b>hence </b><a NAME="E10:29"/>
 <a href="seq_1.html#K21">abs</a> <font color="Maroon">c<sub>2</sub></font> <a href="integra1.html#R3">is_integrable_on</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="ref" href="rfunct_3.html#T37">RFUNCT_3:37</a></i>;<br/>

<i><font color="Green">E33</font></i>: <span class="p1">(<span class="default"><a href="integra1.html#K13">integral</a> <span class="p2">(<span class="default"><a href="rfunct_3.html#K19">max+</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="real_1.html#K3">+</a> <span class="p1">(<span class="default"><a href="integra1.html#K13">integral</a> <span class="p2">(<span class="default"><a href="rfunct_3.html#K20">max-</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> = 
 <a href="integra1.html#K13">integral</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="rfunct_3.html#K19">max+</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="seq_1.html#K6">+</a> <span class="p2">(<span class="default"><a href="rfunct_3.html#K20">max-</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span>
<b>by </b><i><a class="txt" href="integra4.html#E4:29"><i><font color="Green">E30</font></i></a>, <a class="txt" href="integra4.html#E7:29"><i><font color="Green">E31</font></i></a>, <a class="txt" href="integra4.html#E8:29"><i><font color="Green">E32</font></i></a>, <a class="ref" href="integra1.html#T59">INTEGRA1:59</a></i>
<br/>.= 
 <a href="integra1.html#K13">integral</a> <span class="p1">(<span class="default"><a href="seq_1.html#K21">abs</a> <font color="Maroon">c<sub>2</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="rfunct_3.html#T37">RFUNCT_3:37</a></i>
;<br/>
<i><font color="Green">E34</font></i>: <span class="p1">(<span class="default"><a href="integra1.html#K13">integral</a> <span class="p2">(<span class="default"><a href="rfunct_3.html#K19">max+</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="real_1.html#K5">-</a> <span class="p1">(<span class="default"><a href="integra1.html#K13">integral</a> <span class="p2">(<span class="default"><a href="rfunct_3.html#K20">max-</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> = 
 <a href="integra1.html#K13">integral</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="rfunct_3.html#K19">max+</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="seq_1.html#K7">-</a> <span class="p2">(<span class="default"><a href="rfunct_3.html#K20">max-</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span>
<b>by </b><i><a class="txt" href="integra4.html#E4:29"><i><font color="Green">E30</font></i></a>, <a class="txt" href="integra4.html#E7:29"><i><font color="Green">E31</font></i></a>, <a class="txt" href="integra4.html#E8:29"><i><font color="Green">E32</font></i></a>, <a class="ref" href="integra2.html#T33">INTEGRA2:33</a></i>
<br/>.= 
 <a href="integra1.html#K13">integral</a> <font color="Maroon">c<sub>2</sub></font>
<b>by </b><i><a class="ref" href="rfunct_3.html#T37">RFUNCT_3:37</a></i>
;<br/>
<a NAME="E13:29"/><i><font color="Green">E35</font></i>: 
for <font color="Olive">b<sub>1</sub></font> being  <a href="real_1.html#NM1">Real</a> st <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>1</sub></font> holds <br/><span class="p1">(<span class="default"><a href="rfunct_3.html#K19">max+</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="seq_1.html#K2">.</a> <font color="Olive">b<sub>1</sub></font> <a href="xxreal_0.html#NR2" target="_self">&gt;=</a> 0
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="29_3"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">c<sub>3</sub></font> be   <a href="real_1.html#NM1">Real</a>;<br/>

<b>assume </b><a NAME="E1:29_3"/><i><font color="Green">E36</font></i>: 
<font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>1</sub></font>
 ;<br/>

<a NAME="E2:29_3"/>
<font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a>  <a href="relset_1.html#K4">dom</a> <font color="Maroon">c<sub>2</sub></font>
 
<b>by </b><i><a class="ref" href="funct_2.html#D1">FUNCT_2:def 1</a></i>;<br/>
<b>hence </b><a NAME="E3:29_3"/>
<span class="p1">(<span class="default"><a href="rfunct_3.html#K19">max+</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="seq_1.html#K2">.</a> <font color="Maroon">c<sub>3</sub></font> <a href="xxreal_0.html#NR2" target="_self">&gt;=</a> 0
 <b>by </b><i><a class="txt" href="integra4.html#E1:29_3"><i><font color="Green">E36</font></i></a>, <a class="ref" href="rfunct_3.html#T40">RFUNCT_3:40</a></i>;<br/>


</div><b>end;</b></div>
<a NAME="E14:29"/>
for <font color="Olive">b<sub>1</sub></font> being  <a href="real_1.html#NM1">Real</a> st <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>1</sub></font> holds <br/><span class="p1">(<span class="default"><a href="rfunct_3.html#K20">max-</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="seq_1.html#K2">.</a> <font color="Olive">b<sub>1</sub></font> <a href="xxreal_0.html#NR2" target="_self">&gt;=</a> 0
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="29_4"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">c<sub>3</sub></font> be   <a href="real_1.html#NM1">Real</a>;<br/>

<b>assume </b><a NAME="E1:29_4"/><i><font color="Green">E36</font></i>: 
<font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>1</sub></font>
 ;<br/>

<a NAME="E2:29_4"/>
<font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a>  <a href="relset_1.html#K4">dom</a> <font color="Maroon">c<sub>2</sub></font>
 
<b>by </b><i><a class="ref" href="funct_2.html#D1">FUNCT_2:def 1</a></i>;<br/>
<b>hence </b><a NAME="E3:29_4"/>
<span class="p1">(<span class="default"><a href="rfunct_3.html#K20">max-</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="seq_1.html#K2">.</a> <font color="Maroon">c<sub>3</sub></font> <a href="xxreal_0.html#NR2" target="_self">&gt;=</a> 0
 <b>by </b><i><a class="txt" href="integra4.html#E1:29_4"><i><font color="Green">E36</font></i></a>, <a class="ref" href="rfunct_3.html#T43">RFUNCT_3:43</a></i>;<br/>


</div><b>end;</b></div>
<a NAME="E15:29"/><b>then </b><i><font color="Green">E36</font></i>: 
(  <a href="integra1.html#K13">integral</a> <span class="p1">(<span class="default"><a href="rfunct_3.html#K19">max+</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="xxreal_0.html#NR2" target="_self">&gt;=</a> 0 &amp;  <a href="integra1.html#K13">integral</a> <span class="p1">(<span class="default"><a href="rfunct_3.html#K20">max-</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="xxreal_0.html#NR2" target="_self">&gt;=</a> 0 )
 
<b>by </b><i><a class="txt" href="integra4.html#E4:29"><i><font color="Green">E30</font></i></a>, <a class="txt" href="integra4.html#E7:29"><i><font color="Green">E31</font></i></a>, <a class="txt" href="integra4.html#E8:29"><i><font color="Green">E32</font></i></a>, <a class="txt" href="integra4.html#E13:29"><i><font color="Green">E35</font></i></a>, <a class="ref" href="integra2.html#T32">INTEGRA2:32</a></i>;<br/>
<span class="p1">(<span class="default"><a href="integra1.html#K13">integral</a> <span class="p2">(<span class="default"><a href="seq_1.html#K21">abs</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="real_1.html#K5">-</a> <span class="p1">(<span class="default"><a href="integra1.html#K13">integral</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> = 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="integra1.html#K13">integral</a> <span class="p4">(<span class="default"><a href="rfunct_3.html#K19">max+</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="real_1.html#K3">+</a> <span class="p3">(<span class="default"><a href="integra1.html#K13">integral</a> <span class="p4">(<span class="default"><a href="rfunct_3.html#K20">max-</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="real_1.html#K5">-</a> <span class="p2">(<span class="default"><a href="integra1.html#K13">integral</a> <span class="p3">(<span class="default"><a href="rfunct_3.html#K19">max+</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="real_1.html#K3">+</a> <span class="p1">(<span class="default"><a href="integra1.html#K13">integral</a> <span class="p2">(<span class="default"><a href="rfunct_3.html#K20">max-</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span>
<b>by </b><i><a class="txt" href="integra4.html#E11:29"><i><font color="Green">E33</font></i></a>, <a class="txt" href="integra4.html#E12:29"><i><font color="Green">E34</font></i></a></i>
<br/>.= 
2 <a href="real_1.html#K4">*</a> <span class="p1">(<span class="default"><a href="integra1.html#K13">integral</a> <span class="p2">(<span class="default"><a href="rfunct_3.html#K20">max-</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span>

;<br/>
<a NAME="E17:29"/><b>then </b>
<span class="p1">(<span class="default"><a href="integra1.html#K13">integral</a> <span class="p2">(<span class="default"><a href="seq_1.html#K21">abs</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="real_1.html#K5">-</a> <span class="p1">(<span class="default"><a href="integra1.html#K13">integral</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="xxreal_0.html#NR2" target="_self">&gt;=</a> 0
 
<b>by </b><i><a class="txt" href="integra4.html#E15:29"><i><font color="Green">E36</font></i></a>, <a class="ref" href="real_2.html#T121">REAL_2:121</a></i>;<br/>
<a NAME="E18:29"/><b>then </b><i><font color="Green">E37</font></i>: 
 <a href="integra1.html#K13">integral</a> <span class="p1">(<span class="default"><a href="seq_1.html#K21">abs</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="xxreal_0.html#NR2" target="_self">&gt;=</a>  <a href="integra1.html#K13">integral</a> <font color="Maroon">c<sub>2</sub></font>
 
<b>by </b><i><a class="ref" href="real_2.html#T105">REAL_2:105</a></i>;<br/>
<span class="p1">(<span class="default"><a href="integra1.html#K13">integral</a> <span class="p2">(<span class="default"><a href="seq_1.html#K21">abs</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="real_1.html#K3">+</a> <span class="p1">(<span class="default"><a href="integra1.html#K13">integral</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> = 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="integra1.html#K13">integral</a> <span class="p4">(<span class="default"><a href="rfunct_3.html#K19">max+</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="real_1.html#K3">+</a> <span class="p3">(<span class="default"><a href="integra1.html#K13">integral</a> <span class="p4">(<span class="default"><a href="rfunct_3.html#K20">max-</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="real_1.html#K3">+</a> <span class="p2">(<span class="default"><a href="integra1.html#K13">integral</a> <span class="p3">(<span class="default"><a href="rfunct_3.html#K19">max+</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="real_1.html#K5">-</a> <span class="p1">(<span class="default"><a href="integra1.html#K13">integral</a> <span class="p2">(<span class="default"><a href="rfunct_3.html#K20">max-</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span>
<b>by </b><i><a class="txt" href="integra4.html#E11:29"><i><font color="Green">E33</font></i></a>, <a class="txt" href="integra4.html#E12:29"><i><font color="Green">E34</font></i></a></i>
<br/>.= 
2 <a href="real_1.html#K4">*</a> <span class="p1">(<span class="default"><a href="integra1.html#K13">integral</a> <span class="p2">(<span class="default"><a href="rfunct_3.html#K19">max+</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span>

;<br/>
<a NAME="E20:29"/><b>then </b>
<span class="p1">(<span class="default"><a href="integra1.html#K13">integral</a> <span class="p2">(<span class="default"><a href="seq_1.html#K21">abs</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="real_1.html#K3">+</a> <span class="p1">(<span class="default"><a href="integra1.html#K13">integral</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="xxreal_0.html#NR2" target="_self">&gt;=</a> 0
 
<b>by </b><i><a class="txt" href="integra4.html#E15:29"><i><font color="Green">E36</font></i></a>, <a class="ref" href="real_2.html#T121">REAL_2:121</a></i>;<br/>
<a NAME="E21:29"/><b>then </b>
 <a href="real_1.html#K1">-</a> <span class="p1">(<span class="default"><a href="integra1.html#K13">integral</a> <span class="p2">(<span class="default"><a href="seq_1.html#K21">abs</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="xxreal_0.html#R1">&lt;=</a>  <a href="integra1.html#K13">integral</a> <font color="Maroon">c<sub>2</sub></font>
 
<b>by </b><i><a class="ref" href="real_2.html#T110">REAL_2:110</a></i>;<br/>
<b>hence </b><a NAME="E22:29"/>
 <a href="complex1.html#K18">abs</a> <span class="p1">(<span class="default"><a href="integra1.html#K13">integral</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="xxreal_0.html#R1">&lt;=</a>  <a href="integra1.html#K13">integral</a> <span class="p1">(<span class="default"><a href="seq_1.html#K21">abs</a> <font color="Maroon">c<sub>2</sub></font></span>)</span>
 <b>by </b><i><a class="txt" href="integra4.html#E18:29"><i><font color="Green">E37</font></i></a>, <a class="ref" href="absvalue.html#T12">ABSVALUE:12</a></i>;<br/>


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