/nyu p*rl/ Nearly Ultimate PRL. A system for interactive creation of formal mathematics, incluDINg definitions and proofs. It has an extremely rich type system, incluDINg dependent functions, products, sets, quotients and universes. Types are first-class citizens. It is built on Franz Lisp and EDINburgh ML. ["Implementing Mathematics in the Nuprl Proof Development System", R.L. Constable et al, P-H 1986]. (1994-12-13)