bs ; a.as' a.(as' @ bs) (recursive)
T:Type, as,bs:T List. (as @ bs) 
T List
xL.P(x) == (letrec list_exists L = (Case of L; nil False ; h.t P(h) 
list_exists(t)) ) (L)T:Type, P:(T
Prop), L:T List. xL.P(x) Type| Who Cites append? | |
| append | Def as @ bs == Case of as; nil bs ; a.as' a.(as' @ bs) (recursive) |
| Thm* T:Type, as,bs:T List. (as @ bs) T List | |
| list_exists | Def xL.P(x) == (letrec list_exists L = (Case of L; nil False ; h.t P(h) list_exists(t)) ) (L) |
| Thm* T:Type, P:(TProp), L:T List. xL.P(x) Type | |
| letrec_body | Def = b == b |
| letrec_arg | Def x b(x) (x) == b(x) |
| letrec | Def (letrec f b(f)) == b((letrec f b(f)) ) (recursive) |
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