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It has long been recognized that the extreme stretching of vortex lines in OHD inviscid flow past a stagnation point results in singularities at the surface of an immersed body. A general discussion of this nonanalyticity was initiated by Hayes [1] and amplified by the present authors [2], who were temporarily sidetracked from their original purpose of treating three-dimensional MHD flow [3]. In plane flow there is no stretching, and the nonanalyticity which then occurs in MHD1 (Ludford & Murray [4]) is due entirely to the special way in which vorticity is generated near a stagnation point (Ludford [5]). In three-dimensional MHD both effects arise, and it helps to understand the stretching first. The object of the present note is to derive the form of the nonanalyticity by simple arguments. For this purpose it is sufficient to treat the front stagnation point, which is responsible, and an incompressible fluid. With suitable choice of units the flow on the surface z = 0 of the body may be written

The nonanalyticity at the surface of a body in an OHD or MHD stream