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

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

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