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GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it

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<?xml version="1.0" encoding="UTF-8"?>

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<!-- 

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  intro.xml                HomalgToCAS package documentation              Mohamed Barakat

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                                                                            Thomas Breuer

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                                                                           Simon Goertzen

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                                                                            Frank Luebeck

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  Copyright (C) 2007-2009, Lehrstuhl B für Mathematik, RWTH-Aachen University

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This chapter gives a short introduction and explains the philosophy

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behind the package.

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-->

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<Chapter Label="intro">

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<Heading>Introduction</Heading>

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&HomalgToCAS; is one of the core packages of the &homalg; project

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<Cite Key="homalg-project"/>. But as one of the rather technical

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packages, this manual is probably not of interest for the average

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uers. The average user will usually not get in direct contact with the

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operations provided by this package. <P/>

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Quoting from the Appendix <Ref Appendix="The Core Packages"

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BookName="homalg"/> of the &homalg; package manual (&see;

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<Ref Sect="HomalgToCAS" BookName="homalg"/>): <P/>

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<Quoted>The package &HomalgToCAS; (which needs the &homalg; package)

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includes all what is needed to let the black boxes used by &homalg;

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reside in external computer algebra systems. So as mentioned above,

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&HomalgToCAS; is the right place to declare the three &GAP;

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representations external rings, external ring elements, and external

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matrices. Still, &HomalgToCAS; is independent from the external

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computer algebra system with which &GAP; will communicate <E>and</E>

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independent of how this communication physically looks like.</Quoted>

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<Section Label="HomalgToCAS-provides">

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<Heading>&HomalgToCAS; provides ...</Heading>

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<List>

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  <Item>Declaration and construction of

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    <List>

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      <Item>external objects (which are pointers to data (rings,ring

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	elements, matrices, ...) residing in external systems)</Item>

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      <Item>external rings (as a new representation for the

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	&GAP4;-category of homalg rings)</Item>

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      <Item>external ring elements (as a new representation for the

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	&GAP4;-category of homalg ring elements)</Item>

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      <Item>external matrices (as a new representation for the

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	&GAP4;-category of homalg matrices)</Item>

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    </List>

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  </Item>

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  <Item><C>LaunchCAS</C>: the standard interface used by &homalg; to launch

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    external systems</Item>

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  <Item><C>TerminateCAS</C>: the standard interface used by &homalg; to

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    terminate external systems</Item>

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  <Item><C>homalgSendBlocking</C>: the standard interface used by &homalg; to

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    send commands to external systems</Item>

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  <Item>External garbage collection: delete the data in the external

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    systems that became obsolete for &homalg;</Item>

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  <Item><C>homalgIOMode</C>: decide how much of the communication you

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    want to see</Item>

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</List>

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</Section>

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</Chapter>

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