Knuth writes on small portion of Iverson notation (characteristic functions) with examples of its fruitful applications.
http://arxiv.org/PS_cache/math/pdf/9205/9205211v1.pdf Not sure if it's been mentioned here _________________________________________________________________ The New Busy think 9 to 5 is a cute idea. Combine multiple calendars with Hotmail. http://www.windowslive.com/campaign/thenewbusy?tile=multicalendar&ocid=PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_5 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
