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

<span class="kw">set </span><font color="Maroon" title="c2">a</font> =  the   non  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>   <a href="margrel1.html#V2" title="MARGREL1:attr.2">homogeneous</a>   <a href="margrel1.html#V3" title="MARGREL1:attr.3">quasi_total</a>  <a href="partfun1.html#NM1" title="PARTFUN1:NM.1">PartFunc</a> of <span class="p1">(<span class="default"><font color="Maroon" title="c1">A</font> <a href="finseq_2.html#K3" title="FINSEQ_2:func.3">*</a></span>)</span>,<font color="Maroon" title="c1">A</font>;<br/>
<span class="kw">reconsider </span><font color="Maroon" title="c3">a</font> =  the   non  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>   <a href="margrel1.html#V2" title="MARGREL1:attr.2">homogeneous</a>   <a href="margrel1.html#V3" title="MARGREL1:attr.3">quasi_total</a>  <a href="partfun1.html#NM1" title="PARTFUN1:NM.1">PartFunc</a> of <span class="p1">(<span class="default"><font color="Maroon" title="c1">A</font> <a href="finseq_2.html#K3" title="FINSEQ_2:func.3">*</a></span>)</span>,<font color="Maroon" title="c1">A</font> as    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="partfun1.html#K4" title="PARTFUN1:func.4">PFuncs</a> (<span class="p1">(<span class="default"><font color="Maroon" title="c1">A</font> <a href="finseq_2.html#K3" title="FINSEQ_2:func.3">*</a></span>)</span>,<font color="Maroon" title="c1">A</font>) <span class="kw">by</span> <span class="lab"><a class="ref" href="partfun1.html#T45" title="PARTFUN1:th.45">PARTFUN1:45</a></span>;<br/>
<span class="kw">take </span>
<span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span>
; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> ( <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> is  <a href="margrel1.html#V4" title="MARGREL1:attr.4">homogeneous</a>  &amp; <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> is  <a href="margrel1.html#V5" title="MARGREL1:attr.5">quasi_total</a>  &amp; <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> is  <a href="relat_1.html#V2" title="RELAT_1:attr.2">non-empty</a>  &amp;  not <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> is  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>  )</span><br/>

<div><span class="kw">hereby </span> <span class="comment"><font color="firebrick">:: according to </font></span><a class="ref" href="margrel1.html#D23" title="MARGREL1:def.23">MARGREL1:def 23</a> <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> ( <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> is  <a href="margrel1.html#V5" title="MARGREL1:attr.5">quasi_total</a>  &amp; <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> is  <a href="relat_1.html#V2" title="RELAT_1:attr.2">non-empty</a>  &amp;  not <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> is  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>  )</span>
<div class="add"><span class="kw">let </span><font color="Maroon" title="c4">n</font> be   <a href="nat_1.html#NM1" title="NAT_1:NM.1">Nat</a>; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide">  for <font color="Olive" title="b1">h</font> being   <a href="partfun1.html#NM1" title="PARTFUN1:NM.1">PartFunc</a> of <span class="p1">(<span class="default"><font color="Maroon" title="c1">A</font> <a href="finseq_2.html#K3" title="FINSEQ_2:func.3">*</a></span>)</span>,<font color="Maroon" title="c1">A</font>  st <font color="Maroon" title="c4">n</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="finseq_1.html#K4" title="FINSEQ_1:func.4">dom</a> <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> &amp; <font color="Olive" title="b1">h</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> <a href="funct_1.html#K1" title="FUNCT_1:func.1">.</a> <font color="Maroon" title="c4">n</font> holds <br/><font color="Olive" title="b1">h</font> is  <a href="margrel1.html#V2" title="MARGREL1:attr.2">homogeneous</a> </span><br/><span class="kw">let </span><font color="Maroon" title="c5">h</font> be   <a href="partfun1.html#NM1" title="PARTFUN1:NM.1">PartFunc</a> of <span class="p1">(<span class="default"><font color="Maroon" title="c1">A</font> <a href="finseq_2.html#K3" title="FINSEQ_2:func.3">*</a></span>)</span>,<font color="Maroon" title="c1">A</font>; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> ( <font color="Maroon" title="c4">n</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="finseq_1.html#K4" title="FINSEQ_1:func.4">dom</a> <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> &amp; <font color="Maroon" title="c5">h</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> <a href="funct_1.html#K1" title="FUNCT_1:func.1">.</a> <font color="Maroon" title="c4">n</font> implies <font color="Maroon" title="c5">h</font> is  <a href="margrel1.html#V2" title="MARGREL1:attr.2">homogeneous</a>  )</span><br/><span class="kw">assume </span><a NAME="E1:4_1_1_1"/>
<font color="Maroon" title="c4">n</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="finseq_1.html#K4" title="FINSEQ_1:func.4">dom</a> <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span>
 ; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> ( <font color="Maroon" title="c5">h</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> <a href="funct_1.html#K1" title="FUNCT_1:func.1">.</a> <font color="Maroon" title="c4">n</font> implies <font color="Maroon" title="c5">h</font> is  <a href="margrel1.html#V2" title="MARGREL1:attr.2">homogeneous</a>  )</span><br/><a NAME="E2:4_1_1_1"/><span class="kw">then </span>
<font color="Maroon" title="c4">n</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="finseq_1.html#K2" title="FINSEQ_1:func.2">Seg</a> 1
 <span class="kw">by</span> <span class="lab"><a class="ref" href="finseq_1.html#T38" title="FINSEQ_1:th.38">FINSEQ_1:38</a></span>;<br/><a NAME="E3:4_1_1_1"/><span class="kw">then </span>
<font color="Maroon" title="c4">n</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> 1
 <span class="kw">by</span> <span class="lab"><a class="ref" href="finseq_1.html#T2" title="FINSEQ_1:th.2">FINSEQ_1:2</a>, <a class="ref" href="tarski.html#D1" title="TARSKI:def.1">TARSKI:def 1</a></span>;<br/><span class="kw">hence </span><a NAME="E4:4_1_1_1"/>
( <font color="Maroon" title="c5">h</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> <a href="funct_1.html#K1" title="FUNCT_1:func.1">.</a> <font color="Maroon" title="c4">n</font> implies <font color="Maroon" title="c5">h</font> is  <a href="margrel1.html#V2" title="MARGREL1:attr.2">homogeneous</a>  )
 <span class="kw">by</span> <span class="lab"><a class="ref" href="finseq_1.html#T40" title="FINSEQ_1:th.40">FINSEQ_1:40</a></span>; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> verum</span><br/></div>
<span class="kw">end;</span></div>

<div><span class="kw">hereby </span> <span class="comment"><font color="firebrick">:: according to </font></span><a class="ref" href="margrel1.html#D24" title="MARGREL1:def.24">MARGREL1:def 24</a> <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> ( <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> is  <a href="relat_1.html#V2" title="RELAT_1:attr.2">non-empty</a>  &amp;  not <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> is  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>  )</span>
<div class="add"><span class="kw">let </span><font color="Maroon" title="c4">n</font> be   <a href="nat_1.html#NM1" title="NAT_1:NM.1">Nat</a>; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide">  for <font color="Olive" title="b1">h</font> being   <a href="partfun1.html#NM1" title="PARTFUN1:NM.1">PartFunc</a> of <span class="p1">(<span class="default"><font color="Maroon" title="c1">A</font> <a href="finseq_2.html#K3" title="FINSEQ_2:func.3">*</a></span>)</span>,<font color="Maroon" title="c1">A</font>  st <font color="Maroon" title="c4">n</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="finseq_1.html#K4" title="FINSEQ_1:func.4">dom</a> <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> &amp; <font color="Olive" title="b1">h</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> <a href="funct_1.html#K1" title="FUNCT_1:func.1">.</a> <font color="Maroon" title="c4">n</font> holds <br/><font color="Olive" title="b1">h</font> is  <a href="margrel1.html#V3" title="MARGREL1:attr.3">quasi_total</a> </span><br/><span class="kw">let </span><font color="Maroon" title="c5">h</font> be   <a href="partfun1.html#NM1" title="PARTFUN1:NM.1">PartFunc</a> of <span class="p1">(<span class="default"><font color="Maroon" title="c1">A</font> <a href="finseq_2.html#K3" title="FINSEQ_2:func.3">*</a></span>)</span>,<font color="Maroon" title="c1">A</font>; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> ( <font color="Maroon" title="c4">n</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="finseq_1.html#K4" title="FINSEQ_1:func.4">dom</a> <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> &amp; <font color="Maroon" title="c5">h</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> <a href="funct_1.html#K1" title="FUNCT_1:func.1">.</a> <font color="Maroon" title="c4">n</font> implies <font color="Maroon" title="c5">h</font> is  <a href="margrel1.html#V3" title="MARGREL1:attr.3">quasi_total</a>  )</span><br/><span class="kw">assume </span><a NAME="E1:4_1_1_2"/>
<font color="Maroon" title="c4">n</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="finseq_1.html#K4" title="FINSEQ_1:func.4">dom</a> <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span>
 ; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> ( <font color="Maroon" title="c5">h</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> <a href="funct_1.html#K1" title="FUNCT_1:func.1">.</a> <font color="Maroon" title="c4">n</font> implies <font color="Maroon" title="c5">h</font> is  <a href="margrel1.html#V3" title="MARGREL1:attr.3">quasi_total</a>  )</span><br/><a NAME="E2:4_1_1_2"/><span class="kw">then </span>
<font color="Maroon" title="c4">n</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="finseq_1.html#K2" title="FINSEQ_1:func.2">Seg</a> 1
 <span class="kw">by</span> <span class="lab"><a class="ref" href="finseq_1.html#T38" title="FINSEQ_1:th.38">FINSEQ_1:38</a></span>;<br/><a NAME="E3:4_1_1_2"/><span class="kw">then </span>
<font color="Maroon" title="c4">n</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> 1
 <span class="kw">by</span> <span class="lab"><a class="ref" href="finseq_1.html#T2" title="FINSEQ_1:th.2">FINSEQ_1:2</a>, <a class="ref" href="tarski.html#D1" title="TARSKI:def.1">TARSKI:def 1</a></span>;<br/><span class="kw">hence </span><a NAME="E4:4_1_1_2"/>
( <font color="Maroon" title="c5">h</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> <a href="funct_1.html#K1" title="FUNCT_1:func.1">.</a> <font color="Maroon" title="c4">n</font> implies <font color="Maroon" title="c5">h</font> is  <a href="margrel1.html#V3" title="MARGREL1:attr.3">quasi_total</a>  )
 <span class="kw">by</span> <span class="lab"><a class="ref" href="finseq_1.html#T40" title="FINSEQ_1:th.40">FINSEQ_1:40</a></span>; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> verum</span><br/></div>
<span class="kw">end;</span></div>

<div><span class="kw">hereby </span> <span class="comment"><font color="firebrick">:: according to </font></span><a class="ref" href="funct_1.html#D9" title="FUNCT_1:def.9">FUNCT_1:def 9</a> <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide">  not <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> is  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a> </span>
<div class="add"><span class="kw">let </span><font color="Maroon" title="c4">n</font> be    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> ( <font color="Maroon" title="c4">n</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="finseq_1.html#K4" title="FINSEQ_1:func.4">dom</a> <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> implies  not <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> <a href="funct_1.html#K1" title="FUNCT_1:func.1">.</a> <font color="Maroon" title="c4">n</font> is  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>  )</span><br/><span class="kw">assume </span><a NAME="E1:4_1_1_3"/>
<font color="Maroon" title="c4">n</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="finseq_1.html#K4" title="FINSEQ_1:func.4">dom</a> <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span>
 ; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide">  not <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> <a href="funct_1.html#K1" title="FUNCT_1:func.1">.</a> <font color="Maroon" title="c4">n</font> is  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a> </span><br/><a NAME="E2:4_1_1_3"/><span class="kw">then </span>
<font color="Maroon" title="c4">n</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="finseq_1.html#K2" title="FINSEQ_1:func.2">Seg</a> 1
 <span class="kw">by</span> <span class="lab"><a class="ref" href="finseq_1.html#T38" title="FINSEQ_1:th.38">FINSEQ_1:38</a></span>;<br/><a NAME="E3:4_1_1_3"/><span class="kw">then </span>
<font color="Maroon" title="c4">n</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> 1
 <span class="kw">by</span> <span class="lab"><a class="ref" href="finseq_1.html#T2" title="FINSEQ_1:th.2">FINSEQ_1:2</a>, <a class="ref" href="tarski.html#D1" title="TARSKI:def.1">TARSKI:def 1</a></span>;<br/><span class="kw">hence </span><a NAME="E4:4_1_1_3"/>
 not <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> <a href="funct_1.html#K1" title="FUNCT_1:func.1">.</a> <font color="Maroon" title="c4">n</font> is  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a> 
 <span class="kw">by</span> <span class="lab"><a class="ref" href="finseq_1.html#T40" title="FINSEQ_1:th.40">FINSEQ_1:40</a></span>; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> verum</span><br/></div>
<span class="kw">end;</span></div>

<span class="kw">thus </span><a NAME="E5:4_1_1"/>
 not <span class="p1"><a href="margrel1.html#K17" title="MARGREL1:func.17">&lt;*</a><span class="default"><font color="Maroon" title="c3">a</font></span><a href="margrel1.html#K17" title="MARGREL1:func.17">*&gt;</a></span> is  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a> 
 ; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> verum</span><br/>


</div>
