On selection of nonmultiplicative prolongations in computation of Janet bases

We consider three modifications of our basic involutive algorithm for computing polynomial Janet bases. These modifications, which are related to degree-compatible monomial orders, yield specific selection strategies for nonmultiplicative prolongations. Using a standard database of benchmarks designed for testing programs computing Gröbner bases, we compare these algorithmic modifications (in terms of their efficiency) with Faugére’s F4 algorithm, which is built in the Magma computer algebra system.