We could also collaborate on building the J solutions here.
Hello. I've been trying to make the preamble for the Rosetta Code task Forward difference easier to read, with liberal use of whitespace, bigger fonts (for the formulas), and boldface for the A and B lists. I tried to make the presentation as close as possible to what you intended, however, I'm not sure if the program that was supplied was rendered or entered (typed/copied) correctly. If you could give it a once-over, and let me know if you see any glaring errors or omissions. I hope I did justice to your original intent for the task preamble. -- Gerard Schildberger (talk) 17:31, 20 April 2016 (UTC)