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<b>let </b><font color="Maroon" title="c1">X</font> be  non <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>  <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ;<br/><b>let </b><font color="Maroon" title="c2">Y</font>, <font color="Maroon" title="c3">Z</font> be  non <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a> <a href="subset_1.html#NM2" title="SUBSET_1:NM.2">Subset</a> of <a href="numbers.html#K6" title="NUMBERS:func.6">ExtREAL</a> ;<br/>



<b>assume </b><a NAME="E1:67"/><i><font color="Green" title="E53">A1</font></i>: 
( <font color="Maroon" title="c2">Y</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a>  <a href="supinf_1.html#K3" title="SUPINF_1:func.3">REAL</a>  &amp; <font color="Maroon" title="c3">Z</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a>  <a href="supinf_1.html#K3" title="SUPINF_1:func.3">REAL</a>  )
 ;<br/>

<b>let </b><font color="Maroon" title="c4">F1</font> be   <a href="funct_2.html#NM1" title="FUNCT_2:NM.1">Function</a> of <font color="Maroon" title="c1">X</font>,<font color="Maroon" title="c2">Y</font>;<br/><b>let </b><font color="Maroon" title="c5">F2</font> be   <a href="funct_2.html#NM1" title="FUNCT_2:NM.1">Function</a> of <font color="Maroon" title="c1">X</font>,<font color="Maroon" title="c3">Z</font>;<br/>



<b>assume </b><a NAME="E2:67"/>
( <font color="Maroon" title="c4">F1</font> is <a href="supinf_2.html#V3" title="SUPINF_2:attr.3">bounded</a> &amp; <font color="Maroon" title="c5">F2</font> is <a href="supinf_2.html#V3" title="SUPINF_2:attr.3">bounded</a> )
 ;<br/>

<a NAME="E3:67"/><b>then </b>
( <font color="Maroon" title="c4">F1</font> is <a href="supinf_2.html#V1" title="SUPINF_2:attr.1">bounded_above</a> &amp; <font color="Maroon" title="c4">F1</font> is <a href="supinf_2.html#V2" title="SUPINF_2:attr.2">bounded_below</a> &amp; <font color="Maroon" title="c5">F2</font> is <a href="supinf_2.html#V1" title="SUPINF_2:attr.1">bounded_above</a> &amp; <font color="Maroon" title="c5">F2</font> is <a href="supinf_2.html#V2" title="SUPINF_2:attr.2">bounded_below</a> )
 
<b>by </b><i><a class="ref" href="supinf_2.html#D13" target="_self" title="SUPINF_2:def.13">Def13</a></i>;<br/>
<a NAME="E4:67"/><b>then </b>
( <font color="Maroon" title="c4">F1</font> <a href="supinf_2.html#K11" title="SUPINF_2:func.11">+</a> <font color="Maroon" title="c5">F2</font> is <a href="supinf_2.html#V1" title="SUPINF_2:attr.1">bounded_above</a> &amp; <font color="Maroon" title="c4">F1</font> <a href="supinf_2.html#K11" title="SUPINF_2:func.11">+</a> <font color="Maroon" title="c5">F2</font> is <a href="supinf_2.html#V2" title="SUPINF_2:attr.2">bounded_below</a> )
 
<b>by </b><i><a class="txt" href="supinf_2.html#E1:67"><i><font color="Green" title="E53">A1</font></i></a>, <a class="ref" href="supinf_2.html#T49" target="_self" title="SUPINF_2:th.49">Th49</a>, <a class="ref" href="supinf_2.html#T50" target="_self" title="SUPINF_2:th.50">Th50</a></i>;<br/>
<b>hence </b><a NAME="E5:67"/>
<font color="Maroon" title="c4">F1</font> <a href="supinf_2.html#K11" title="SUPINF_2:func.11">+</a> <font color="Maroon" title="c5">F2</font> is <a href="supinf_2.html#V3" title="SUPINF_2:attr.3">bounded</a>
 <b>by </b><i><a class="ref" href="supinf_2.html#D13" target="_self" title="SUPINF_2:def.13">Def13</a></i>;<br/>


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