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<Chapter Label="intro">
<Heading>Introduction</Heading>

<Section Label="philosophy">
<Heading>Philosophy</Heading>

This package is about group recognition. It provides a generic
framework to implement methods of group recognition, regardless of
what computational representation is used. This means, that the code
in this package is useful at least for permutation groups, and matrix
groups and projective groups over finite fields.
The setup is described in <Cite Key="NS06"/>. <P/>

The framework allows to build composition trees and handles the builtup
and usage of these trees in a generic way. It also contains a
method selection (described in Chapter <Ref Chap="methsel"/>) that allows
to install recognition methods in a convenient way and that automatically
tries to try the different available methods in a sensible order.
</Section>

<Section Label="overview">
<Heading>Overview over this manual</Heading>

Chapter <Ref Chap="install"/> describes the installation of this package.<P/>

Chapter <Ref Chap="recognition"/> describes the generic, recursive procedure
used for group recognition throughout this package. At the heart of this
procedure is the definition of <Q>FindHomomorphism</Q> methods, which is also
described in that chapter. For the choice of the right method for finding a
homomorphism (or an isomorphism) we use another generic procedure, the
<Q>method selection</Q> which is not to be confused with the &GAP; method
selection.<P/>

Our own method selection system is described in detail in Chapter <Ref
Chap="methsel"/>, because it is interesting in its own right and might be
useful in other circumstances.<P/>

Chapter <Ref Chap="methods"/> describes the available <Q>FindHomomorphism</Q>
methods.<P/>

Chapter <Ref Chap="afterrecog"/> explains what one can do with a
completed recognition tree.<P/>

Finally, Chapter <Ref Chap="examples"/> shows some instructive examples of the
usage of this package.<P/>

</Section>

<Section Label="feedback">
<Heading>Feedback and support</Heading>

If you have any bug reports, feature requests, or suggestions, then please
tell us via the <URL Text="issue tracker on
GitHub">https://github.com/gap-packages/recog/issues.

In addition, the <Package>recog</Package> package has a mailing list, at
<URL Text="recog@gap-system.org">mailto:recog@gap-system.org</URL>,
which can be used for holding discussions, sharing information, and asking
questions about the package. You can find more information, and register to
receive the mail sent to this list, at
<URL>https://mail.gap-system.org/mailman/listinfo/recog</URL>.

</Section>

<Section Label="literature">
<Heading>Literature (temporary)</Heading>

TODO Find the appropriate place to put these references, so that they appear
in the bibliography:
<Cite Key="LNPS06"/>
<Cite Key="BLS97"/>
<Cite Key="JLNP13"/>
<Cite Key="DLGLO13"/>
<Cite Key="LGO09"/>
<Cite Key="BLGN+05"/>
<Cite Key="BLGN+03"/>
<Cite Key="NP98"/>
<Cite Key="NP99"/>
<Cite Key="NP97"/>
<Cite Key="Pra99"/>
<Cite Key="CLG97a"/>
<Cite Key="CLG97b"/>
<Cite Key="CLGM+95"/>
<Cite Key="BNS06"/>
<Cite Key="CNRD09"/>
<Cite Key="BHLGO15"/>
<Cite Key="Neu09"/>
<Cite Key="Ser03"/>
<Cite Key="KK15"/>
<Cite Key="LO16"/>
<Cite Key="LO07"/>
<Cite Key="HLO+08"/>
<Cite Key="BB99"/>
<Cite Key="BBS09"/>
<Cite Key="BS01"/>
<Cite Key="Bro01"/>
<Cite Key="Bro08"/>
<Cite Key="Bro03"/>
<Cite Key="BK06"/>
<Cite Key="BK01"/>
<Cite Key="CLG98"/>
<Cite Key="CLGO06"/>
<Cite Key="CLG01"/>
<Cite Key="CFL97"/>
<Cite Key="DLGO15"/>
<Cite Key="GH97"/>
<Cite Key="GLGO06"/>
<Cite Key="HLGOR96a"/>
<Cite Key="HLGOR96b"/>
<Cite Key="HR94"/>
<Cite Key="IL00"/>
<Cite Key="KM13"/>
<Cite Key="KM15"/>
<Cite Key="LGO97a"/>
<Cite Key="LGO02"/>
<Cite Key="LGO97b"/>
<Cite Key="LG01"/>
<Cite Key="LMO07"/>
<Cite Key="NP92"/>
<Cite Key="Nie05"/>
<Cite Key="O'B11"/>
<Cite Key="O'B06"/>
<Cite Key="Pak00"/>
<Cite Key="Par84"/>

</Section>



</Chapter>

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