2 papers
math.NT2026
A Half-Constant Upper Bound for Chowla's Cosine Problem
Bryan Bu, Fayzan Khan, Hyunjun Yi +4
Let lambda(n) denote the infimum of -min_x sum_{a in A} cos(ax) over all sets A of n positive integers. While the classical Sidon-difference construction yields lambda(n) <= (1 + o…
math.CO2026
There are no nontrivial uniquely C_9-saturated graphs
Fayzan Khan
A graph G is uniquely C_t-saturated if G contains no cycle of length t and, for every edge e of the complement, G+e contains exactly one cycle of length t; it is nontrivial if it h…