> Is it intentional that the "Computational_Algebra" theory does not
> import "Polynomial_Factorial"?

Yes.  Polynomial_Factorial requires Field_as_Ring, which does a
substantial modification to the type class hierarchy, pulling it apart
from long-established traditions in HOL-Main.  I have been reluctant to
enforce this on any material derived from the session entry point.

Cheers,
        Florian

-- 

PGP available:
http://isabelle.in.tum.de/~haftmann/pgp/florian_haftmann_at_informatik_tu_muenchen_de

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