A Generic and Executable Formalization of Signature-Based Gröbner Basis Algorithms

Abstract: We present a generic and executable formalization of signature-based algorithms (such as Faug`ere's $F_5$) for computing Gr\"obner bases, as well as their mathematical background, in the Isabelle/HOL proof assistant. Said algorithms are currently the best known algorithms for computing Gr\"obner bases in terms of computational efficiency. The formal development attempts to be as generic as possible, generalizing most known variants of signature-based algorithms, but at the same time the implemented functions are effectively executable on concrete input for efficiently computing mechanically verified Gr\"obner bases. Besides correctness the formalization also proves that under certain conditions the algorithms a-priori detect and avoid all useless reductions to zero, and return minimal signature Gr\"obner bases. To the best of our knowledge, the formalization presented here is the only formalization of signature-based Gr\"obner basis algorithms in existence so far.