/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)