The Factorization Algorithm of Berlekamp and Zassenhaus

Jose Divasón 🌐, Sebastiaan J. C. Joosten 📧, René Thiemann 📧 and Akihisa Yamada 📧

October 14, 2016

Abstract

We formalize the Berlekamp-Zassenhaus algorithm for factoring square-free integer polynomials in Isabelle/HOL. We further adapt an existing formalization of Yun’s square-free factorization algorithm to integer polynomials, and thus provide an efficient and certified factorization algorithm for arbitrary univariate polynomials.

The algorithm first performs a factorization in the prime field GF(p) and then performs computations in the integer ring modulo p^k, where both p and k are determined at runtime. Since a natural modeling of these structures via dependent types is not possible in Isabelle/HOL, we formalize the whole algorithm using Isabelle’s recent addition of local type definitions.

Through experiments we verify that our algorithm factors polynomials of degree 100 within seconds.

License

BSD License

Topics

Session Berlekamp_Zassenhaus