Programmable calculus operations in electromagnetic space using space-time-coding metasurface. - Shi, Hao Tian; Zhang, Lei; Wu, Rui Yuan; Zheng, Yi Ning; Chen, Xiao Qing; Li, Yuanzhe; He, Shi; Wu, Jun Wei; Cheng, Qiang; Cui, Tie Jun (National Science Review, 2026)