This person’s namesake number is low for tracers in PIV and equals the ratio between a particle’s characteristic response time and an obstacle's response time. The Oseen equations (-5[1])build upon a flow regime named for this person (10[1])that exhibits a low (10[1])Reynolds (10[1])number, where no creeping (-5[1])flow can occur (10[1])around a disk in this person’s namesake paradox. (10[1]-5[2])6 (10[1])pi (10[1])times (-5[1])viscosity (10[5])times radius (10[1])times flow (-5[1])velocity (10[1])equals (10[1])a sphere’s drag according to a law (10[2])named for this person, (10[1]-5[1])who also names a 3D analog (-5[1])of Green’s theorem. (10[2])This person (10[1])is the second (10[1])namesake (10[1])of a set of equations whose solutions’ (10[1])existence (10[1])and smoothness (10[1])are a Millenium Prize problem (10[2])and describe viscous (10[1])fluid (10[2])flow. (10[1])For 10 points, name this Irish scientist who names those equations with Claude-Louis Navier. (10[1]) (10[4])■END■