FlashMP: Fast Discrete Transform-Based Solver for Preconditioning Maxwell's Equations on GPUs. - Haoyuan Zhang; Yaqian Gao; Xinxin Zhang; Jialin Li; Runfeng Jin; Yidong Chen; Feng Zhang; Wu Yuan; Wenpeng Ma; Shan Liang; Jian Zhang; Zhonghua Lu (CoRR, 2025)