English

Lazy Kronecker Product

Data Structures and Algorithms 2026-03-23 v1 Computational Complexity

Abstract

In this paper, we show how to generalize the lazy update regime from dynamic matrix product [Cohen, Lee, Song STOC 2019, JACM 2021] to dynamic kronecker product. We provide an algorithm that uses nω(k/2,k/2,a)an^{\omega( \lceil k/2 \rceil, \lfloor k/2 \rfloor, a )-a} amortized update time and nω((ks)/2,(ks)/2,a) n^{\omega( \lceil(k-s)/2 \rceil, \lfloor (k-s)/2 \rfloor,a )} worst case query time for dynamic kronecker product problem. Unless tensor MV conjecture is false, there is no algorithm that can use both nω(k/2,k/2,a)aΩ(1)n^{\omega( \lceil k/2 \rceil, \lfloor k/2 \rfloor, a )-a-\Omega(1)} amortized update time, and nω((ks)/2,(ks)/2,a)Ω(1) n^{\omega( \lceil(k-s)/2 \rceil, \lfloor (k-s)/2 \rfloor,a )-\Omega(1)} worst case query time.

Cite

@article{arxiv.2603.19443,
  title  = {Lazy Kronecker Product},
  author = {Zhao Song},
  journal= {arXiv preprint arXiv:2603.19443},
  year   = {2026}
}
R2 v1 2026-07-01T11:28:59.668Z