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May 27, 2016 at 19:56 comment added Robert Bryant @StevenMurray: Ah! Isn't that the way it always is; hindsight is always clearer!
May 27, 2016 at 18:25 vote accept StevenMurray
May 27, 2016 at 18:25 comment added StevenMurray This is correct, though it took me a while to make sure of it :) In fact, if I had approached the problem in a better way initially then I would have gotten to this result without all the inverses.
May 21, 2016 at 22:21 history answered Robert Bryant CC BY-SA 3.0