[Picture] [Picture] [Picture] [Picture] What I wrote on the right above is not so clear. The solution which starts with zero slope from 1 hits zero at some finite value a which depends only on p. Scaling this solution (by scaling x and u simultaneously) gives all solutions which start out with zero slope. [Picture] [Picture] Above: read right board first. [Picture] [Picture] Above left: unknown given map should be unknown map (erase given). Above right: erase inner product in the middle. [Picture]