short-intervals

Oppermann intervals in F_q[t]: characteristic-2 counterexamples with exact counts for d ≤ 3, an exact d = 2 formula for odd q, and a Hayes-FFT census

The dispersion obstacle, sieve barriers at the level 1/2, and short-interval mean squares. The remainder as a trilinear form in Kloosterman sums with a fixed argument, the Atkin–Lehner projection of the symmetric remainder, optimality of Richert's weight (the gap to (7,4) is structural), level Δ−ε in intervals (X, X+X^Δ], spectral decomposition.