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

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#W  factors.gd      Alnuth - ALgebraic NUmber THeory        Andreas Distler
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#F  FactorsPolynomialPari, function( <poly> )
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##  Factorizes the polynomial <poly> defined over an algebraic extension of
##  the rationals using PARI/GP
##
##  As a method of 'Factors' ? AD
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DeclareGlobalFunction("FactorsPolynomialPari");

##  ensure backwards compatibility with formerly documented functionality
DeclareSynonym("FactorsPolynomialKant", FactorsPolynomialPari);

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#F  FactorsPolynomialAlgExt, function( <H>, <poly> )
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##  Factorizes the rational polynomial <poly> over the field <H>, a proper
##  algebraic extension of the rationals, using PARI/GP
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DeclareGlobalFunction( "FactorsPolynomialAlgExt" );

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#M  IrrFacsAlgExtPol(<f>) . . . . . lists of irreducible factors of rational 
##                  polynomial over algebraic extensions, initialize default
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DeclareAttribute( "IrrFacsAlgExtPol", IsUnivariatePolynomial, "mutable" );

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#F  StoreFactorsAlgExtPol( <pring>, <upol>, <factlist> ) . store factors list
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DeclareGlobalFunction( "StoreFactorsAlgExtPol" );


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#E