In At Play With J Edn 1, there were 4 questions left as exercises for the reader. In Edn 2 we want to provide the answers in an Appendix.
Just so I don't get them wrong, could the forum please suggest what the answers should be? You may have to refer to the Wiki page. I'm putting each question in a separate thread. +++++ In Chapter 5 Jacobi's method http://www.jsoftware.com/jwiki/Doc/Articles/Play113 [see midway] "Problem 1: Define a verb which takes as argument a positive even integer n and yields a permutation which, repeatedly applied to a conforming identity permutation, produces, in successive pairs of items, all possible choices of 2 items from n, with no duplications. Problem 2: How many of the !n permutations of even order n are solutions to problem 1?" +++++ Ian Clark Subeditor, APWJ Edn 2 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
