From: keith on 11 Apr 2010 03:22 Bernard Parisse's Erable 3.2 manual mentions (p.49) that: "There is currently only one program available in the other directory, written in UserRPL by John Wilson, that I have translated into SysRPL, it is named TNBA for tangent, normal, binormal, acceleration. It takes a 3dimensional vector (as a list) at level 1 (e.g. { '2*T' 1 'T^2' }) and returns the position, tangent, normal and binormal vectors as well as the tangential and normal acceleration." I checked hpcalc.org and google searched but have found no listing of John Wilson's original Differential Geometry UserRPL program. Does anyone know where it might be available? Thanks, Keith

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