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

<b>defpred </b><font color="Maroon">S<sub>1</sub></font>[   <a href="hidden.html#M1">set</a> ,   <a href="hidden.html#M1">set</a> ,   <a href="hidden.html#M1">set</a> ] <b>means </b>( ( <font color="Maroon">a<sub>2</sub></font> is  <a href="glib_000.html#V2">finite</a> <a href="lexbfs.html#V3" target="_self">natural-vlabeled</a> <a href="lexbfs.html#V6" target="_self">finite-v2labeled</a> <a href="lexbfs.html#V7" target="_self">natsubset-v2labeled</a> <a href="lexbfs.html#NM3">VVGraph</a> &amp; <font color="Maroon">a<sub>1</sub></font> is   <a href="nat_1.html#NM1">Nat</a> &amp;  ex <font color="Olive">nn</font> being  <a href="nat_1.html#NM1">Nat</a> ex <font color="Olive">Gn</font>, <font color="Olive">Gn1</font> being <a href="glib_000.html#V2">finite</a> <a href="lexbfs.html#V3" target="_self">natural-vlabeled</a> <a href="lexbfs.html#V6" target="_self">finite-v2labeled</a> <a href="lexbfs.html#V7" target="_self">natsubset-v2labeled</a> <a href="lexbfs.html#NM3">VVGraph</a> st <br/>( <font color="Maroon">a<sub>1</sub></font> <a href="hidden.html#R1">=</a> <font color="Olive">nn</font> &amp; <font color="Maroon">a<sub>2</sub></font> <a href="hidden.html#R1">=</a> <font color="Olive">Gn</font> &amp; <font color="Maroon">a<sub>3</sub></font> <a href="hidden.html#R1">=</a> <font color="Olive">Gn1</font> &amp; <font color="Olive">Gn1</font> <a href="hidden.html#R1">=</a>  <a href="lexbfs.html#K17" target="_self">LexBFS:Step</a> <font color="Olive">Gn</font> ) ) or ( (  not <font color="Maroon">a<sub>2</sub></font> is  <a href="glib_000.html#V2">finite</a> <a href="lexbfs.html#V3" target="_self">natural-vlabeled</a> <a href="lexbfs.html#V6" target="_self">finite-v2labeled</a> <a href="lexbfs.html#V7" target="_self">natsubset-v2labeled</a> <a href="lexbfs.html#NM3">VVGraph</a> or  not <font color="Maroon">a<sub>1</sub></font> is   <a href="nat_1.html#NM1">Nat</a> ) &amp; <font color="Maroon">a<sub>2</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">a<sub>3</sub></font> ) );<br/>
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="141_1_1_1"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">n</font> be    <a href="hidden.html#M1">set</a> , <font color="Maroon">x</font> be    <a href="hidden.html#M1">set</a> ;<br/><div><a class="txt" onclick="hs2(this)" href="javascript:()" title="141_1_1_1_1"><b>now </b></a><div class="add"><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="141_1_1_1_1_1"><b>per </b></a><a class="txt" onclick="hs(this)" href="javascript:()"><b>cases </b></a><span class="hide"><a NAME="E1:141_1_1_1_1_1"/>
( ( <font color="Maroon">x</font> is  <a href="glib_000.html#V2">finite</a> <a href="lexbfs.html#V3" target="_self">natural-vlabeled</a> <a href="lexbfs.html#V6" target="_self">finite-v2labeled</a> <a href="lexbfs.html#V7" target="_self">natsubset-v2labeled</a> <a href="lexbfs.html#NM3">VVGraph</a> &amp; <font color="Maroon">n</font> is   <a href="nat_1.html#NM1">Nat</a> ) or  not <font color="Maroon">x</font> is  <a href="glib_000.html#V2">finite</a> <a href="lexbfs.html#V3" target="_self">natural-vlabeled</a> <a href="lexbfs.html#V6" target="_self">finite-v2labeled</a> <a href="lexbfs.html#V7" target="_self">natsubset-v2labeled</a> <a href="lexbfs.html#NM3">VVGraph</a> or  not <font color="Maroon">n</font> is   <a href="nat_1.html#NM1">Nat</a> )
 </span>;<br/><div class="add"><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="141_1_1_1_1_1_1"><b>suppose </b></a><a NAME="E1:141_1_1_1_1_1_1"/><i><font color="Green">E34</font></i>: 
( <font color="Maroon">x</font> is  <a href="glib_000.html#V2">finite</a> <a href="lexbfs.html#V3" target="_self">natural-vlabeled</a> <a href="lexbfs.html#V6" target="_self">finite-v2labeled</a> <a href="lexbfs.html#V7" target="_self">natsubset-v2labeled</a> <a href="lexbfs.html#NM3">VVGraph</a> &amp; <font color="Maroon">n</font> is   <a href="nat_1.html#NM1">Nat</a> )
 ;<br/><div class="add"><b>then reconsider </b><font color="Maroon">Gn</font> = <font color="Maroon">x</font> as  <a href="glib_000.html#V2">finite</a> <a href="lexbfs.html#V3" target="_self">natural-vlabeled</a> <a href="lexbfs.html#V6" target="_self">finite-v2labeled</a> <a href="lexbfs.html#V7" target="_self">natsubset-v2labeled</a> <a href="lexbfs.html#NM3">VVGraph</a> ;<br/><b>reconsider </b><font color="Maroon">nn</font> = <font color="Maroon">n</font> as   <a href="nat_1.html#NM1">Nat</a> <b>by </b><i><a class="ref" href="lexbfs.html#D2" target="_self">Def2</a></i>;<br/><b>reconsider </b><font color="Maroon">xx</font> = <font color="Maroon">x</font> as  <a href="glib_000.html#V2">finite</a> <a href="lexbfs.html#V3" target="_self">natural-vlabeled</a> <a href="lexbfs.html#V6" target="_self">finite-v2labeled</a> <a href="lexbfs.html#V7" target="_self">natsubset-v2labeled</a> <a href="lexbfs.html#NM3">VVGraph</a> <b>by </b><i><a class="ref" href="lexbfs.html#D2" target="_self">Def2</a></i>;<br/><b>consider </b><font color="Maroon">SGn</font> being  <a href="glib_000.html#V2">finite</a> <a href="lexbfs.html#V3" target="_self">natural-vlabeled</a> <a href="lexbfs.html#V6" target="_self">finite-v2labeled</a> <a href="lexbfs.html#V7" target="_self">natsubset-v2labeled</a> <a href="lexbfs.html#NM3">VVGraph</a><b> such that </b><br/><a NAME="E6:141_1_1_1_1_1_1"/><i><font color="Green">E36</font></i>: 
<font color="Maroon">SGn</font> <a href="hidden.html#R1">=</a>  <a href="lexbfs.html#K17" target="_self">LexBFS:Step</a> <font color="Maroon">Gn</font>
 ;<br/><b>thus </b><a NAME="E7:141_1_1_1_1_1_1"/>
 ex <font color="Olive">y</font> being   <a href="hidden.html#M1">set</a>  st <font color="Maroon">S<sub>1</sub></font>[<font color="Maroon">n</font>,<font color="Maroon">x</font>,<font color="Olive">y</font>]
 <b>by </b><i><a class="ref" href="lexbfs.html#D2" target="_self">Def2</a>, </i>;<br/></div><b>end;</b></div><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="141_1_1_1_1_1_2"><b>suppose </b></a><a NAME="E1:141_1_1_1_1_1_2"/>
(  not <font color="Maroon">x</font> is  <a href="glib_000.html#V2">finite</a> <a href="lexbfs.html#V3" target="_self">natural-vlabeled</a> <a href="lexbfs.html#V6" target="_self">finite-v2labeled</a> <a href="lexbfs.html#V7" target="_self">natsubset-v2labeled</a> <a href="lexbfs.html#NM3">VVGraph</a> or  not <font color="Maroon">n</font> is   <a href="nat_1.html#NM1">Nat</a> )
 ;<br/><div class="add"><b>hence </b><a NAME="E2:141_1_1_1_1_1_2"/>
 ex <font color="Olive">y</font> being   <a href="hidden.html#M1">set</a>  st <font color="Maroon">S<sub>1</sub></font>[<font color="Maroon">n</font>,<font color="Maroon">x</font>,<font color="Olive">y</font>]
 ;<br/></div><b>end;</b></div></div><b>end;</b></div></div><b>end;</b></div><b>hence </b><a NAME="E2:141_1_1_1"/>
 ex <font color="Olive">y</font> being   <a href="hidden.html#M1">set</a>  st <font color="Maroon">S<sub>1</sub></font>[<font color="Maroon">n</font>,<font color="Maroon">x</font>,<font color="Olive">y</font>]
 ;<br/></div><b>end;</b></div>
<a NAME="E2:141_1_1"/><b>then </b><i><font color="Green">E38</font></i>: 
for <font color="Olive">n</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a> <br/> for <font color="Olive">x</font> being   <a href="hidden.html#M1">set</a>   ex <font color="Olive">y</font> being   <a href="hidden.html#M1">set</a>  st <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">n</font>,<font color="Olive">x</font>,<font color="Olive">y</font>]
 
;<br/>
<a NAME="E3:141_1_1"/><i><font color="Green">E39</font></i>: 
for <font color="Olive">n</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a> <br/> for <font color="Olive">x</font>, <font color="Olive">y1</font>, <font color="Olive">y2</font> being   <a href="hidden.html#M1">set</a>   st <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">n</font>,<font color="Olive">x</font>,<font color="Olive">y1</font>] &amp; <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">n</font>,<font color="Olive">x</font>,<font color="Olive">y2</font>] holds <br/><font color="Olive">y1</font> <a href="hidden.html#R1">=</a> <font color="Olive">y2</font>
 
;<br/>
<b>consider </b><font color="Maroon">IT</font> being   <a href="funct_1.html#NM1">Function</a><b> such that </b><br/><a NAME="E5:141_1_1"/><i><font color="Green">E40</font></i>: 
(  <a href="relat_1.html#K1">dom</a> <font color="Maroon">IT</font> <a href="hidden.html#R1">=</a>  <a href="numbers.html#K5">NAT</a>  &amp; <font color="Maroon">IT</font> <a href="funct_1.html#K1">.</a> 0 <a href="hidden.html#R1">=</a>  <a href="lexbfs.html#K12" target="_self">LexBFS:Init</a> <font color="Maroon">G</font> &amp; ( for <font color="Olive">n</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>  holds  <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">n</font>,<font color="Maroon">IT</font> <a href="funct_1.html#K1">.</a> <font color="Olive">n</font>,<font color="Maroon">IT</font> <a href="funct_1.html#K1">.</a> <span class="p1">(<span class="default"><font color="Olive">n</font> <a href="nat_1.html#K1">+</a> 1</span>)</span>] ) )
 <b>from </b><i><a class="ref" href="recdef_1.html#S1">RECDEF_1:sch 1</a>(<a class="ref" href="lexbfs.html#D2" target="_self">Def2</a>, );<br/></i>
<b>reconsider </b><font color="Maroon">IT</font> = <font color="Maroon">IT</font> as    <a href="pboole.html#M1">ManySortedSet</a> of  <a href="numbers.html#K5">NAT</a>  <b>by </b><i>, <a class="ref" href="pboole.html#D3">PBOOLE:def 3</a></i>;<br/>
<b>defpred </b><font color="Maroon">S<sub>2</sub></font>[  <a href="nat_1.html#NM1">Nat</a>] <b>means </b><font color="Maroon">IT</font> <a href="funct_1.html#K1">.</a> <font color="Maroon">a<sub>1</sub></font> is  <a href="glib_000.html#V2">finite</a> <a href="lexbfs.html#V3" target="_self">natural-vlabeled</a> <a href="lexbfs.html#V6" target="_self">finite-v2labeled</a> <a href="lexbfs.html#V7" target="_self">natsubset-v2labeled</a> <a href="lexbfs.html#NM3">VVGraph</a>;<br/>
<a NAME="E7:141_1_1"/><i><font color="Green">E42</font></i>: 
<font color="Maroon">S<sub>2</sub></font>[0]
 
<b>by </b><i/>;<br/>
<div><i><font color="Green">E45</font></i>: <a class="txt" onclick="hs2(this)" href="javascript:()" title="141_1_1_2"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">n</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/><b>assume </b><a NAME="E1:141_1_1_2"/>
<font color="Maroon">S<sub>2</sub></font>[<font color="Maroon">n</font>]
 ;<br/><b>then consider </b><font color="Maroon">nn</font> being   <a href="nat_1.html#NM1">Nat</a>, <font color="Maroon">Gn</font> being  <a href="glib_000.html#V2">finite</a> <a href="lexbfs.html#V3" target="_self">natural-vlabeled</a> <a href="lexbfs.html#V6" target="_self">finite-v2labeled</a> <a href="lexbfs.html#V7" target="_self">natsubset-v2labeled</a> <a href="lexbfs.html#NM3">VVGraph</a>, <font color="Maroon">Gn1</font> being  <a href="glib_000.html#V2">finite</a> <a href="lexbfs.html#V3" target="_self">natural-vlabeled</a> <a href="lexbfs.html#V6" target="_self">finite-v2labeled</a> <a href="lexbfs.html#V7" target="_self">natsubset-v2labeled</a> <a href="lexbfs.html#NM3">VVGraph</a><b> such that </b><br/><a NAME="E3:141_1_1_2"/><i><font color="Green">E46</font></i>: 
( <font color="Maroon">n</font> <a href="hidden.html#R1">=</a> <font color="Maroon">nn</font> &amp; <font color="Maroon">IT</font> <a href="funct_1.html#K1">.</a> <font color="Maroon">n</font> <a href="hidden.html#R1">=</a> <font color="Maroon">Gn</font> &amp; <font color="Maroon">IT</font> <a href="funct_1.html#K1">.</a> <span class="p1">(<span class="default"><font color="Maroon">n</font> <a href="nat_1.html#K1">+</a> 1</span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">Gn1</font> &amp; <font color="Maroon">Gn1</font> <a href="hidden.html#R1">=</a>  <a href="lexbfs.html#K17" target="_self">LexBFS:Step</a> <font color="Maroon">Gn</font> )
 <b>by </b><i/>;<br/><b>thus </b><a NAME="E4:141_1_1_2"/>
<font color="Maroon">S<sub>2</sub></font>[<font color="Maroon">n</font> <a href="nat_1.html#K1">+</a> 1]
 <b>by </b><i/>;<br/></div><b>end;</b></div>
<a NAME="E9:141_1_1"/><i><font color="Green">E47</font></i>: 
for <font color="Olive">n</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>  holds  <font color="Maroon">S<sub>2</sub></font>[<font color="Olive">n</font>]
 
<b>from </b><i><a class="ref" href="nat_1.html#S1">NAT_1:sch 1</a>(, );<br/></i>
<a NAME="E10:141_1_1"/><b>then </b>
for <font color="Olive">n</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>  holds  <font color="Maroon">IT</font> <a href="funct_1.html#K1">.</a> <font color="Olive">n</font> is   <a href="glib_000.html#NM2">_Graph</a>
 
;<br/>
<b>then reconsider </b><font color="Maroon">IT</font> = <font color="Maroon">IT</font> as   <a href="glib_000.html#NM11">GraphSeq</a> <b>by </b><i><a class="ref" href="glib_000.html#D55">GLIB_000:def 55</a></i>;<br/>
<a NAME="E12:141_1_1"/>
for <font color="Olive">n</font> being  <a href="nat_1.html#NM1">Nat</a> holds <br/> ( <font color="Maroon">IT</font> <a href="glib_000.html#K42">.</a> <font color="Olive">n</font> is <a href="glib_003.html#V3">[VLabeled]</a> &amp; <font color="Maroon">IT</font> <a href="glib_000.html#K42">.</a> <font color="Olive">n</font> is <a href="lexbfs.html#V4" target="_self">[V2Labeled]</a> )
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="141_1_1_3"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">n</font> be   <a href="nat_1.html#NM1">Nat</a>;<br/>

<a NAME="E1:141_1_1_3"/>
<font color="Maroon">n</font> <a href="hidden.html#R2">in</a>  <a href="numbers.html#K5">NAT</a> 
 
<b>by </b><i><a class="ref" href="ordinal1.html#D13">ORDINAL1:def 13</a></i>;<br/>
<b>hence </b><a NAME="E2:141_1_1_3"/>
( <font color="Maroon">IT</font> <a href="glib_000.html#K42">.</a> <font color="Maroon">n</font> is <a href="glib_003.html#V3">[VLabeled]</a> &amp; <font color="Maroon">IT</font> <a href="glib_000.html#K42">.</a> <font color="Maroon">n</font> is <a href="lexbfs.html#V4" target="_self">[V2Labeled]</a> )
 <b>by </b><i/>;<br/>


</div><b>end;</b></div>
<b>then reconsider </b><font color="Maroon">IT</font> = <font color="Maroon">IT</font> as   <a href="lexbfs.html#NM9">VVGraphSeq</a> <b>by </b><i><a class="ref" href="glib_003.html#D26">GLIB_003:def 26</a>, <a class="txt" href="lexbfs.html#E2:141_1_1"><i><font color="Green">E38</font></i></a></i>;<br/>
<a NAME="E14:141_1_1"/>
for <font color="Olive">n</font> being  <a href="nat_1.html#NM1">Nat</a> holds <br/> ( <font color="Maroon">IT</font> <a href="lexbfs.html#K9" target="_self">.</a> <font color="Olive">n</font> is <a href="glib_000.html#V2">finite</a> &amp; <font color="Maroon">IT</font> <a href="lexbfs.html#K9" target="_self">.</a> <font color="Olive">n</font> is <a href="lexbfs.html#V3" target="_self">natural-vlabeled</a> &amp; <font color="Maroon">IT</font> <a href="lexbfs.html#K9" target="_self">.</a> <font color="Olive">n</font> is <a href="lexbfs.html#V6" target="_self">finite-v2labeled</a> &amp; <font color="Maroon">IT</font> <a href="lexbfs.html#K9" target="_self">.</a> <font color="Olive">n</font> is <a href="lexbfs.html#V7" target="_self">natsubset-v2labeled</a> )
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="141_1_1_4"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">n</font> be   <a href="nat_1.html#NM1">Nat</a>;<br/>

<a NAME="E1:141_1_1_4"/>
<font color="Maroon">n</font> <a href="hidden.html#R2">in</a>  <a href="numbers.html#K5">NAT</a> 
 
<b>by </b><i><a class="ref" href="ordinal1.html#D13">ORDINAL1:def 13</a></i>;<br/>
<b>hence </b><a NAME="E2:141_1_1_4"/>
( <font color="Maroon">IT</font> <a href="lexbfs.html#K9" target="_self">.</a> <font color="Maroon">n</font> is <a href="glib_000.html#V2">finite</a> &amp; <font color="Maroon">IT</font> <a href="lexbfs.html#K9" target="_self">.</a> <font color="Maroon">n</font> is <a href="lexbfs.html#V3" target="_self">natural-vlabeled</a> &amp; <font color="Maroon">IT</font> <a href="lexbfs.html#K9" target="_self">.</a> <font color="Maroon">n</font> is <a href="lexbfs.html#V6" target="_self">finite-v2labeled</a> &amp; <font color="Maroon">IT</font> <a href="lexbfs.html#K9" target="_self">.</a> <font color="Maroon">n</font> is <a href="lexbfs.html#V7" target="_self">natsubset-v2labeled</a> )
 <b>by </b><i/>;<br/>


</div><b>end;</b></div>
<b>then reconsider </b><font color="Maroon">IT</font> = <font color="Maroon">IT</font> as  <a href="glib_000.html#V14">finite</a> <a href="lexbfs.html#V11" target="_self">natural-vlabeled</a> <a href="lexbfs.html#V16" target="_self">finite-v2labeled</a> <a href="lexbfs.html#V17" target="_self">natsubset-v2labeled</a> <a href="lexbfs.html#NM9">VVGraphSeq</a> <b>by </b><i><a class="ref" href="glib_000.html#D60">GLIB_000:def 60</a>, , , <a class="txt" href="lexbfs.html#E5:141_1_1"><i><font color="Green">E40</font></i></a></i>;<br/>
<b>take </b>
<font color="Maroon">IT</font>
;<br/>

<b>thus </b><a NAME="E16:141_1_1"/>
<font color="Maroon">IT</font> <a href="lexbfs.html#K9" target="_self">.</a> 0 <a href="hidden.html#R1">=</a>  <a href="lexbfs.html#K12" target="_self">LexBFS:Init</a> <font color="Maroon">G</font>
 <b>by </b><i/>;<br/>

<b>let </b><font color="Maroon">n</font> be   <a href="nat_1.html#NM1">Nat</a>;<br/>

<a NAME="E17:141_1_1"/><i><font color="Green">E48</font></i>: 
<font color="Maroon">n</font> <a href="hidden.html#R2">in</a>  <a href="numbers.html#K5">NAT</a> 
 
<b>by </b><i><a class="ref" href="ordinal1.html#D13">ORDINAL1:def 13</a></i>;<br/>
<b>consider </b><font color="Maroon">nn</font> being   <a href="nat_1.html#NM1">Nat</a>, <font color="Maroon">Gn</font> being  <a href="glib_000.html#V2">finite</a> <a href="lexbfs.html#V3" target="_self">natural-vlabeled</a> <a href="lexbfs.html#V6" target="_self">finite-v2labeled</a> <a href="lexbfs.html#V7" target="_self">natsubset-v2labeled</a> <a href="lexbfs.html#NM3">VVGraph</a>, <font color="Maroon">Gn1</font> being  <a href="glib_000.html#V2">finite</a> <a href="lexbfs.html#V3" target="_self">natural-vlabeled</a> <a href="lexbfs.html#V6" target="_self">finite-v2labeled</a> <a href="lexbfs.html#V7" target="_self">natsubset-v2labeled</a> <a href="lexbfs.html#NM3">VVGraph</a><b> such that </b><br/><a NAME="E19:141_1_1"/><i><font color="Green">E49</font></i>: 
( <font color="Maroon">n</font> <a href="hidden.html#R1">=</a> <font color="Maroon">nn</font> &amp; <font color="Maroon">IT</font> <a href="lexbfs.html#K9" target="_self">.</a> <font color="Maroon">n</font> <a href="hidden.html#R1">=</a> <font color="Maroon">Gn</font> &amp; <font color="Maroon">IT</font> <a href="lexbfs.html#K9" target="_self">.</a> <span class="p1">(<span class="default"><font color="Maroon">n</font> <a href="xcmplx_0.html#K2">+</a> 1</span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">Gn1</font> &amp; <font color="Maroon">Gn1</font> <a href="hidden.html#R1">=</a>  <a href="lexbfs.html#K17" target="_self">LexBFS:Step</a> <font color="Maroon">Gn</font> )
 <b>by </b><i>, <a class="ref" href="lexbfs.html#T5" target="_self">Th5</a></i>;<br/>
<b>thus </b><a NAME="E20:141_1_1"/>
<font color="Maroon">IT</font> <a href="lexbfs.html#K9" target="_self">.</a> <span class="p1">(<span class="default"><font color="Maroon">n</font> <a href="xcmplx_0.html#K2">+</a> 1</span>)</span> <a href="hidden.html#R1">=</a>  <a href="lexbfs.html#K17" target="_self">LexBFS:Step</a> <span class="p1">(<span class="default"><font color="Maroon">IT</font> <a href="lexbfs.html#K9" target="_self">.</a> <font color="Maroon">n</font></span>)</span>
 <b>by </b><i><a class="ref" href="lexbfs.html#T6" target="_self">Th6</a></i>;<br/>


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