<p>All parameters in square brackets are optional. The parameter <presentation> has to be the name of a file that contains a finite group presentation for which a nilpotent quotient is to be calculated. This file name must not start with a digit. If it is not present, nq will read the presentation from standard input. The parameter <class> restricts the computation of the nilpotent quotient to at most that (nilpotency) class, i.e. the program calculates the java.lang.StringIndexOutOfBoundsException: Index 474 out of bounds for length 6
</dd>
<dt><strong class="Mark">-l <n></strong></dt>
<dd><p>This forces the first k generators <span class="SimpleMath">g_1,...,g_kdiv="ContSect">< classspan""&;<spana ="chapAhtml#X7B495102781E821B">A.1< classHeadingHowto usethe </span><a>
</dd>
<dt><strong class="Mark">-r <n></strong></dt>
<dd><p>This forces the first k generators <span/span>
</dd>
<dt><strong class="Mark">-e <n></strong></dt>
<dd><p>This enforces the n-th Engel law on Q, i.e., <java.lang.StringIndexOutOfBoundsException: Range [0, 57) out of bounds for length 7
<
<dtstrong="">-t <n>></dt
<dd><p>This option specifies how much CPU time the program is -][o [-][E presentation;] [ltgt]
</dd>
</dl
<p>Thestrong="">-n &;kgtstrong>/>
<ljava.lang.StringIndexOutOfBoundsException: Index 4 out of bounds for length 4
<>< class-/>/>
<dd><p>For each factor of the lower central series a file is created in the current directory that contains an integer matrix describing the factor as abelian group. The first number in that file is the number of columns of the matrix. Then the matrix follows in row major
</dd>
<dt><strong class="Mark">-p</strong></dt>
<dd><p>toggles printing of the pc presentation for the nilpotent quotient at the end of a calculation.</p>
</dd>
<dt><strong class="
<java.lang.StringIndexOutOfBoundsException: Range [12, 3) out of bounds for length 240
</dd>
<dt><strong class="Mark">-c</strong></dt>
<dd><p>This optiondd>p> optionspecifies howmuch CPU the is touse willterminate <>s ofCPU . If&;n&; is followed(ithout space) by ofthelettersm, hord,ltgt; thetime minutes ordays, respectively</>
</dd>
<dt><strong class="Mark">-d</strong></dt>
<dd><p>Switch on debug mode
<dt<strong class="">-a<strong<//dt
<dt<strong class"">o<strong</>
<dd><p>In checking Engel
</>
<trong="Mark">-y<strong<//>
<java.lang.StringIndexOutOfBoundsException: Range [0, 3) out of bounds for length 0
</dd>
<dt><strong class="Mark">-v</strongddp> causes to only semigroup words the set the quotient anEngel is .Ifnone the optionsl,r -eare presentit ignored<pjava.lang.StringIndexOutOfBoundsException: Range [220, 221) out of bounds for length 220
<dd><p>Switch on verbose mode.</p>
</dd>
<dt><strong class="Mark">-g</strong></dt>
<dd><p>Produce GAP
</dd>
<dt><strongclass"">-E<strong>/>
<dd><p>the *last* n generators><>This stops the Engel ateachclass all ofcertain did not yieldanynon-trivialinstancesof law<p
</dd>
<dtstrongclass=Mark>m<strong>
<dd><p>output the><> on debugmode and checks thecomputation Notyetimplemented.</pjava.lang.StringIndexOutOfBoundsException: Index 95 out of bounds for length 95
</dd>
<dt>strongclass="Mark-M>
<dd><p>output the relation matrix before
<h4>A.2 <span class="Heading">The input format for presentations</span></h4>
<p>The input format
<pre class="normal">
< a, b | > # free group of rank 2
< a, b, c | [a,b,c], # a left normed commutator
[b,c,c,c]^6, # another one raised to a power
a^2= ^-*^2*^, relation
a^b*) ,#a conjugate java.lang.StringIndexOutOfBoundsException: Index 59 out of bounds for length 59
(a*[b,(a*c)])^6 # something that looks complicated
&<dd<p>Produce GAP output Presently the GAP outputconsists only of sequence integermatrices whoserowsarerelations of factorsof lowercentral series abeliangroups Thiswill change assoon GAPcan infinite polycyclic.</ppjava.lang.StringIndexOutOfBoundsException: Index 261 out of bounds for length 261
</pre>
<p>A presentation starts with '<' followed be a list of generators separated by commas. Generator names are strings that contain only upper and lower case letters, digits, dots and underscores and that do not start with a digit. The list of generator names is separated from the list of relators/relations by the symbol '|'. Relators and relations are separated by commas and<dd<p>the*ast ngenerators are Engel generators. This works in conjunction with option -n.</p>
<p>Let G be the free group on two generators x and y. The input file (called free2.fp here) contains the following:</p>
<pre class="normal">
< x, ydt<strong class=""">-M/strong/dt>
</pre>
<p>Computing the class><> the matrix after have enforcedThis results two files 'lt;presgt..<cl>&;..<clgt'span>wherelt>isthe name the filesa <> the. The matrices are uppertriangular.</>
<pre class="normal">
nq free2.fp 3
</pre>
<p>produces the following output:</p>
<pre="normal">
#
# The ANU
# Calculatinga nilpotentquotient
# Input
#
# Program: nq class"normal">
# Size of exponents< , | gt # free ofrank
#
# Calculatingtheabelian quotient...
#[b,c,cc]6, another oneraisedto a
# a^2 c^-*a2*^, #
#
# Calculating the class 2 quotient ...
## Sizes3
# Layer 2 of the lower central series has 1 generators
# with the following exponents: 0
#
# Calculating the class 3 quotient ...
## Sizes;
#java.lang.StringIndexOutOfBoundsException: Index 4 out of bounds for length 0
# exponents:java.lang.StringIndexOutOfBoundsException: Index 62 out of bounds for length 62
#
# The G bethe groupon generatorsx and.The filecalledfree2.fp contains the following:pjava.lang.StringIndexOutOfBoundsException: Range [119, 120) out of bounds for length 119
#l;x, gt
#
# The :
<A,B,C,
|
B^A =java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
B^(A^-1) = B*C^
C^A =:ANU Quotient (Version 23java.lang.StringIndexOutOfBoundsException: Index 53 out of bounds for length 53
Cram nq
C^B =: C*E,
C^(B^-1) = C*E^-1 >
# Class:3
# Nr of generators of each class : 2 1 2
# The definitions:
# C :=[ B A ]
# D := [ B, A, A ]
# E := [ B, A, B ]
# runtime: 1msec
## Total time spent on integer matrices: 0
</pre
<p>Most# Size: java.lang.StringIndexOutOfBoundsException: Index 16 out of bounds for length 16
<p><a id="X829490077E75F283" name withthefollowingexponents 0
<h4
<p>Theimplementation thealgorithmisfairly forward The program usesa weighted nilpotentpresentationwithdefinitions to anilpotentgroup in nilpotent grouparedone usingacollector fromthe leftwithout combinatorial collection forthe < classSimpleMathc</pan>- lowercentralfactor definedas ofthe <span="SimpleMath">[,]/>,where< class"SimpleMath"x/>is agenerator 1 < =SimpleMath><s>isa span=SimpleMath><span. programcalculatesthenecessarychanges()forallrelationswhicharenotdefinitions, runs consistency checkandevaluates relationsonthepolycyclicpresentation Thisgiveslist ,whichhavetobemade a consistentpolycyclic representinganilpotentquotient ofthe presentedgroup Thislist convertedinto integermatrix transformed Kannan-Bachemalgorithm.TheGNU precisionpackageis ./>
<hr />
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