Popov Form Computation for Matrices of Ore Polynomials
Popov Form Computation for Matrices of Ore Polynomials
复制标题
矿石多项式矩阵的波波夫形式计算
DOI:
10.1145/3087604.3087650
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发表时间:
2017
期刊:
影响因子:
--
通讯作者:
Arne Storjohann
中科院分区:
文献类型:
--
作者:
Mohamed Khochtali;Johan Rosenkilde né Nielsen;Arne Storjohann
Let F[∂ ; σ, δ] be a ring of Ore polynomials over a field. We give a new deterministic algorithm for computing the Popov form P of a non-singular matrix A ∈ F[∂ ; σ, δ]n x n. Our main focus is to ensure controlled growth in the size of coefficients from F in the case F = K(z), and even K = Q. Our algorithms are based on constructing from A a linear system over F and performing a structured fraction-free Gaussian elimination. The algorithm is output sensitive, with a cost that depends on the orthogonality defect of the input matrix: the sum of the row degrees in A minus the sum of the row degrees in P. The resulting bit-complexity for the differential and shift polynomial case over Q(z) improves upon the previous best.
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