<html ><head ><title >aclib : a GAP 4 package - Index </title ></head >
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<h1 ><font face="Gill Sans,Helvetica,Arial" >aclib</font > : a <font face="Gill Sans,Helvetica,Arial" >GAP</font > 4 package - Index </h1 >
<p >
<a href="#idxA" >A </A >
<a href="#idxB" >B </A >
<a href="#idxD" >D</A >
<a href="#idxE" >E</A >
<a href="#idxH" >H</A >
<a href="#idxI" >I </A >
<a href="#idxM" >M</A >
<a href="#idxN" >N</A >
<a href="#idxO" >O</A >
<a href="#idxP" >P </A >
<a href="#idxR" >R</A >
<a href="#idxT" >T</A >
<H2><A NAME="idxA" >A </A ></H2>
<dl >
<dt >Algorithms for almost crystallographic groups <a href="CHAP002.htm" >2 .0 </a >
<dt >AlmostCrystallographicDim3 <a href="CHAP003.htm#SSEC001.1" >3 .1 .1 </a >
<dt >AlmostCrystallographicDim4 <a href="CHAP003.htm#SSEC001.1" >3 .1 .1 </a >
<dt >AlmostCrystallographicGroup <a href="CHAP003.htm#SSEC001.1" >3 .1 .1 </a >
<dt >AlmostCrystallographicInfo <a href="CHAP003.htm#SSEC003.1" >3 .3 .1 </a >
<dt >AlmostCrystallographicPcpDim3 <a href="CHAP003.htm#SSEC002.1" >3 .2 .1 </a >
<dt >AlmostCrystallographicPcpDim4 <a href="CHAP003.htm#SSEC002.1" >3 .2 .1 </a >
<dt >AlmostCrystallographicPcpGroup <a href="CHAP003.htm#SSEC002.1" >3 .2 .1 </a >
</dl ><p >
<H2><A NAME="idxB" >B </A ></H2>
<dl >
<dt >Betti numbers <a href="CHAP002.htm#SECT002" >2 .2 </a >
<dt >BettiNumber <a href="CHAP002.htm#SSEC002.2" >2 .2 .2 </a >
<dt >BettiNumbers <a href="CHAP002.htm#SSEC002.3" >2 .2 .3 </a >
</dl ><p >
<H2><A NAME="idxD" >D</A ></H2>
<dl >
<dt >Determination of certain extensions <a href="CHAP002.htm#SECT003" >2 .3 </a >
</dl ><p >
<H2><A NAME="idxE" >E</A ></H2>
<dl >
<dt >Example computations I <a href="CHAP004.htm#SECT001" >4 .1 </a >
<dt >Example computations II <a href="CHAP004.htm#SECT002" >4 .2 </a >
<dt >Example computations III <a href="CHAP004.htm#SECT003" >4 .3 </a >
<dt >Example computations with almost crystallographic groups <a href="CHAP004.htm" >4 .0 </a >
</dl ><p >
<H2><A NAME="idxH" >H</A ></H2>
<dl >
<dt >HasExtensionOfType <a href="CHAP002.htm#SSEC003.1" >2 .3 .1 </a >
<dt >HolonomyGroup <a href="CHAP003.htm#SSEC002.3" >3 .2 .3 </a >
</dl ><p >
<H2><A NAME="idxI" >I </A ></H2>
<dl >
<dt >IsAlmostBieberbachGroup <a href="CHAP002.htm#SSEC001.2" >2 .1 .2 </a >
<dt >IsAlmostCrystallographic <a href="CHAP002.htm#SSEC001.1" >2 .1 .1 </a >
<dt >IsomorphismPcpGroup <a href="CHAP003.htm#SSEC002.2" >3 .2 .2 </a >
</dl ><p >
<H2><A NAME="idxM" >M</A ></H2>
<dl >
<dt >More about almost crystallographic groups <a href="CHAP001.htm#SECT001" >1 .1 </a >
<dt >More about the type and the defining parameters <a href="CHAP003.htm#SECT003" >3 .3 </a >
</dl ><p >
<H2><A NAME="idxN" >N</A ></H2>
<dl >
<dt >NaturalHomomorphismOnHolonomyGroup <a href="CHAP003.htm#SSEC002.3" >3 .2 .3 </a >
</dl ><p >
<H2><A NAME="idxO" >O</A ></H2>
<dl >
<dt >OrientationModule <a href="CHAP002.htm#SSEC002.1" >2 .2 .1 </a >
</dl ><p >
<H2><A NAME="idxP" >P </A ></H2>
<dl >
<dt >Polycyclically presented groups <a href="CHAP003.htm#SECT002" >3 .2 </a >
<dt >Properties of almost crystallographic groups <a href="CHAP002.htm#SECT001" >2 .1 </a >
</dl ><p >
<H2><A NAME="idxR" >R</A ></H2>
<dl >
<dt >Rational matrix groups <a href="CHAP003.htm#SECT001" >3 .1 </a >
</dl ><p >
<H2><A NAME="idxT" >T</A ></H2>
<dl >
<dt >The Almost Crystallographic Groups Package <a href="CHAP001.htm" >1 .0 </a >
<dt >The catalog of almost crystallographic groups <a href="CHAP003.htm" >3 .0 </a >
<dt >The electronic versus the printed library <a href="CHAP003.htm#SECT004" >3 .4 </a >
</dl ><p >
[<a href="chapters.htm" >Up</a >]<p >
<P >
<address >aclib manual<br >August 2025
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