“…We introduce an auxiliary canonical variable and functions: z() conformally mapping the upper half-plane >0 to the fl ow region z under the correspondence of points D = 0 , E = e , A = 1 , A 1 = a 1 , B = b , (a 1 , b are unknown affi xes of points A 1 and B in the plane ), C = ∞, and functions d / d and dz / d. We emphasize that, compared to [9], an additional boundary angular singular point A 1 appears here in the fl ow region z, which complicates the solution considerably.…”