Nuprl Lemma : concat_wf
11,40
postcript
pdf
T
:Type,
ll
:(
T
List List). concat(
ll
)
(
T
List)
latex
Definitions
x
:
A
.
B
(
x
)
,
t
T
,
concat(
ll
)
Lemmas
reduce
wf
,
append
wf
origin
T:Type, ll:(T List List). concat(ll) 
(T List) T:Type, ll:(T List List). concat(ll) (T List) x:A. B(x) T