hyp,concl:Formula List.
f
hyp.(
(f) > 0) 
fconcl.((f) > 0) ( < hyp,concl > ) = 0
not_list_exists_rank_gt_0_rank_0
xL.P(x)
== (letrec list_exists L = (Case of L; nil 
False ; h.t P(h) 
list_exists(t)) ) (L)
Thm* hyp,concl:Formula List.
fhyp.((f) > 0)
fconcl.((f) > 0) ( < hyp,concl > ) = 0
not_list_exists_rank_gt_0_rank_0
In prior sections: list 3 jlc