[GAP Forum] Issue with ALNUTH

[Dr. Kashyap Rajeevsarathy]

Dear Forum,

There seems to be some problem factoring rational polynomials using ALNUTH.
Please glance through the following examples and let me know if I am doing
something wrong, of if there is a problem with the package installation:







*1) gap> x := Indeterminate(Rationals,"x");;gap> pol := x^2-3;x^2-3gap> L
:= FieldByPolynomial(x^2-3);<algebraic extension over the Rationals of
degree 2>gap> y := Indeterminate( L, "y" );;gap>
FactorsPolynomialAlgExt(L,pol);*







*Error, AL_EXECUTABLE, the executable for PARI/GP, has to be set called
fromProcessPariGP( Concatenation( input ), "polyfactors.gp
<http://polyfactors.gp>" ) called fromPolynomialFactorsDescriptionPari( H,
coeffs ) called fromFactorsPolynomialPari( AlgExtEmbeddedPol( H, poly ) )
called from<function "FactorsPolynomialAlgExt">( <arguments> )called from
read-eval loop at line 5 of *stdin*you can 'quit;' to quit to outer loop,
oryou can 'return;' to continue*

















*2) gap> SplittingField(pol);<algebraic extension over the Rationals of
degree 2>gap> x := Indeterminate(Rationals,"x");       xgap> pol := x^2 -
3;x^2-3gap> L := SplittingField(pol);<algebraic extension over the
Rationals of degree 2>gap> FactorsPolynomialAlgExt(L,pol);Error,
AL_EXECUTABLE, the executable for PARI/GP, has to be set called from
ProcessPariGP( Concatenation( input ), "polyfactors.gp
<http://polyfactors.gp>" ) called fromPolynomialFactorsDescriptionPari( H,
coeffs ) called fromFactorsPolynomialPari( AlgExtEmbeddedPol( H, poly ) )
called from<function "FactorsPolynomialAlgExt">( <arguments> )called from
read-eval loop at line 9 of *stdin*you can 'quit;' to quit to outer loop,
oryou can 'return;' to continue*

Sincerely,
Kashyap
-- 
Kashyap Rajeevsarathy
Assistant Professor,
Indian Institute of Science Education and Research (IISER) Bhopal,
Indore By-pass Road,
Bhauri, Bhopal - 462066,
Madhya Pradesh, India.
Phone: +91-755-669-2364
Website: https://home.iiserb.ac.in/~kashyap