2 papers
cs.CR2026
Principled Detection of Coordinated Manipulation from Aggregate Distortion and Account Reuse
Qian Guo, Yidan Hu, Rui Zhang
Coordinated manipulation is collective: plausible accounts can jointly distort ratings, rankings, and engagement. Existing defenses primarily construct evidence from identities, gr…
cs.GT2026
The Geometry of Coalition Power: Majorization, Lattices, and Displacement in Multiwinner Elections
Qian Guo, Yidan Hu, Rui Zhang
How much influence can a coordinated coalition exert in a multiwinner Top- election under a positional scoring rule? We study the maximum displacement problem: with coalition si…