Re: [math-fun] ellipsoid from girths: multivariate series reversion

FL: "'But that's obvious. No, wait --- is it obvious?' (G. H. Hardy, apocryphally)." "The story is told of G. H. Hardy (and of other people) that during a lecture he said 'It is obvious... *Is* it obvious?' left the room, and returned fifteen minutes later, saying 'Yes, it's obvious.' I was present once when Rogosinski asked Hardy whether the story were true. Hardy would admit only that he might have said 'It's obvious... *Is* it obvious?' (brief pause) 'Yes it's obvious.'" —Ralph P. Boas, Jr., taken from Lion Hunting and Other Mathematical Pursuits (1995).