Nuprl - Pf zero_rank_valid_or_falsifiable 1 1 1 1 1 1 2 1 2 1 2 1 1 2 1 1 1

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At: zero rank valid or falsifiable 1 1 1 1 1 1 2 1 2 1 2 1 1 2 1 1 1

1. L: Sequent List
2. eqS: {Sequent=}
3. eqF: {Formula=}
4. sL.((s) = 0)
5. sL.disjoint(eqF;s.H;s.C)
6. hyp: Formula List
7. concl: Formula List
8. < hyp,concl > (eqS) L
9. disjoint(eqF;hyp;concl)
10. (v.if v(eqF) hyp3 ;v(eqF) concl3 else 3 fi) Assignment
11. z: Formula
12. z(eqF) concl
13. v: Var
14. z = v

if v(eqF) hyp3 ;v(eqF) concl3 else 3 fi = 3

By: FwdThru Thm* P:. P P = true [-3] THEN HypSubst -2 -1 THEN HypSubst -1 0

Generated subgoal:

1 15. v(eqF) concl = true
if v(eqF) hyp3 ;true3 else 3 fi = 3

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