Nuprl - Some Definitions

tm_pi	`Def (p) == Void+P(p)` `Thm* M:PM{i}. (M) Type`
tm_proto_pi	`Def P(p) == 1of(2of(2of(p)))` `Thm* p:PM{i}. P(p) Type`
pi2	`Def 2of(t) == t.2` `Thm* B:(AType), p:a:AB(a). 2of(p) B(1of(p))`
pi1	`Def 1of(t) == t.1` `Thm* B:(AType), p:a:AB(a). 1of(p) A`