/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)