OP-00316 Solution claimed The sharp Beurling–Ahlfors bound for planar elliptic systems CA · AIM Open Applied Problems · Beurling–Ahlfors transform · quasiconformal mappings · singular integrals
OP-00399 Open The sharp vector Riesz inequality for multidimensional potential fields CA · AIM Open Applied Problems · Riesz transforms · sharp constants · singular integrals
OP-00722 Solution claimed Stein’s Hilbert-transform bound along Lipschitz directions CA · AIM Open Applied Problems · directional Hilbert transform · Lipschitz vector fields · singular integrals
OP-00729 Solution claimed A uniform L3 estimate for the triangular Hilbert transform CA · AIM Open Applied Problems · multilinear singular integrals · triangular Hilbert transform