(9steps total) PrintForm Definitions Lemmas ElisTarskiPf A Sections NuprlLIB Doc

At: s1 1 2 1 1 1 2
1. t: Term
2. s(t) = SUBX((t)[f(t)/X]; SUBX(f(t); UP(f(t))))
3. (t)[f(t)/X] = t
s(t) = SUBX(t; SUBX(f(t); UP(f(t))))
By: HypSubst 3 2
Generated subgoals:

None

About:
equal

(9steps total) PrintForm Definitions Lemmas ElisTarskiPf A Sections NuprlLIB Doc